CINXE.COM
Nuclear Terrorism: Assessment of U.S. Strategies to Prevent, Counter, and Respond to Weapons of Mass Destruction | The National Academies Press
<!doctype html> <html lang="en"> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="cache-control" content="no-cache"/> <title>Nuclear Terrorism: Assessment of U.S. Strategies to Prevent, Counter, and Respond to Weapons of Mass Destruction | The National Academies Press</title> <meta name="DC.creator" content="National Academies of Sciences, Engineering, and Medicine"> <meta name="DC.identifier" content="doi:10.17226/27215"> <meta name="DC.issued" content="2024-06-18"> <meta name="DC.title" content="Nuclear Terrorism: Assessment of U.S. Strategies to Prevent, Counter, and Respond to Weapons of Mass Destruction"> <meta name="article:publisher" content="https://www.facebook.com/NationalAcademiesPress"> <meta name="citation_author" content="National Academies of Sciences, Engineering, and Medicine"> <meta name="citation_doi" content="10.17226/27215"> <meta name="citation_isbn" content="978-0-309-70868-5"> <meta name="citation_pdf_url" content="https://nap.nationalacademies.org/download/27215"> <meta name="citation_publication_date" content="2024/06/18"> <meta name="citation_title" content="Nuclear Terrorism: Assessment of U.S. Strategies to Prevent, Counter, and Respond to Weapons of Mass Destruction"> <meta name="description" content="Read online, download a free PDF, or order a copy in print."> <meta name="og:description" content="Read online, download a free PDF, or order a copy in print."> <meta name="og:image" content="https://nap.nationalacademies.org/cover/27215/450"> <meta name="og:site_name" content="The National Academies Press"> <meta name="og:title" content="Nuclear Terrorism: Assessment of U.S. Strategies to Prevent, Counter, and Respond to Weapons of Mass Destruction"> <meta name="og:type" content="book"> <meta name="og:url" content="https://nap.nationalacademies.org/catalog/27215/nuclear-terrorism-assessment-of-us-strategies-to-prevent-counter-and"> <meta name="prism.doi" content="10.17226/27215"> <meta name="twitter:card" content="summary"> <meta name="twitter:description" content="Read online, download a free PDF, or order a copy in print."> <meta name="twitter:image:height" content="675"> <meta name="twitter:image:src" content="https://nap.nationalacademies.org/cover/27215/450"> <meta name="twitter:image:width" content="450"> <meta name="twitter:site" content="@theNASEM"> <meta name="twitter:title" content="Nuclear Terrorism: Assessment of U.S. Strategies to Prevent, Counter, and Respond to Weapons of Mass Destruction"> <meta name="twitter:url" content="https://nap.nationalacademies.org/catalog/27215/nuclear-terrorism-assessment-of-us-strategies-to-prevent-counter-and"> <link rel="canonical" href="https://nap.nationalacademies.org/catalog/27215/nuclear-terrorism-assessment-of-us-strategies-to-prevent-counter-and"> <script> // if (document.location.hostname.search(/nap\.edu$/) < 0) { // url = "http://www.na" + "p.edu" + document.location.pathname + document.location.search // document.location.replace(url); // } </script> <!--[if lt IE 9]> <script src="https://oss.maxcdn.com/libs/html5shiv/3.7.0/html5shiv.js"></script> <script src="/includes/js/svg4everybody.ie8.min.js"></script> <![endif]--> <meta name="alexaVerifyID" content="02J2SepmgvpkhVXcfeE98cX3HKs" /> <link href="//nap.nationalacademies.org/stylesheets/nasem-nap.css" rel="stylesheet" type="text/css"> <link href="//nap.nationalacademies.org/stylesheets/topnav-lite-min.css" rel="stylesheet" type="text/css" /> <link href="//nap.nationalacademies.org/stylesheets/component.css" rel="stylesheet" type="text/css" /> <!--[if gte IE 5]> <style type="text/css"> #blanket {filter:alpha(opacity=65);}</style><![endif]--> <script src="/includes/js/jquery-3.5.1.min.js"></script> <script src="/includes/js/jquery.dotdotdot.min.js" type="text/javascript"></script> <!--<script src="https://www.nationalacademies.org//_cache_4662/_themesdelivery/nasuwTheme/assets/vendor.js"></script>--> <!-- <script src="/includes/js/jquery.min-3.1.0.js"></script> --> <!-- MC Goal Tracking --> <script type="text/javascript"> var $mcGoal = {'settings':{'uuid':'eaea39b6442dc4e0d08e6aa4a','dc':'us4'}}; (function() { var sp = document.createElement('script'); sp.type = 'text/javascript'; sp.async = true; sp.defer = true; sp.src = ('https:' == document.location.protocol ? 'https://s3.amazonaws.com/downloads.mailchimp.com' : 'http://downloads.mailchimp.com') + '/js/goal.min.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(sp, s); })(); </script> <!-- Data Layer --> <script> window.dataLayer = window.dataLayer || [];dataLayer.push({ 'pageTitle' : "Nuclear Terrorism: Assessment of U.S. Strategies to Prevent, Counter, and Respond to Weapons of Mass Destruction", 'bookID' : "27215", 'bookTitle' : "Nuclear Terrorism", 'subtitle' : "Assessment of U.S. Strategies to Prevent, Counter, and Respond to Weapons of Mass Destruction", 'date' : "2024-06-18 08:00:00", 'report_type' : { 'code': "consensus", 'word': "Consensus Study Report" }, 'status' : "prepublication", 'display_authors' : "National Academies of Sciences, Engineering, and Medicine; <a href="/author/DELS">Division on Earth and Life Studies</a>; <a href="/author/NRSB">Nuclear and Radiation Studies Board</a>; <a href="/initiative/committee-on-assessing-and-improving-strategies-for-preventing-countering-and-responding-to-weapons-of-mass-destruction-terrorism-nuclear-threats">Committee on Assessing and Improving Strategies for Preventing, Countering, and Responding to Weapons of Mass Destruction Terrorism: Nuclear Threats</a>", 'orgs': [ { 'acronym': "NRSB", 'name': "", 'url': "https://www.nationalacademies.org/nrsb/nuclear-and-radiation-studies-board" }, ], 'divisions': [ { 'acronym': "", 'name': "", 'url': "http://dels.nas.edu" }, ], 'bookTopic' : "Conflict and Security Issues", 'bookDivision' : "DELS", 'loginStatus' : "guest", 'form' : "subscribe" }); </script> <script>(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start': new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0], j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src= 'https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f); })(window,document,'script','dataLayer','GTM-N9MJ23');</script> <!-- Global site tag (gtag.js) - Google AdWords: 1071160892 --> <script async src="https://www.googletagmanager.com/gtag/js?id=AW-1071160892"></script> <script> window.dataLayer = window.dataLayer || []; function gtag(){dataLayer.push(arguments);} gtag('js', new Date()); gtag('config', 'AW-1071160892'); gtag('config', 'AW-1071160892'); </script> <script id="mcjs">!function(c,h,i,m,p){m=c.createElement(h),p=c.getElementsByTagName(h)[0],m.async=1,m.src=i,p.parentNode.insertBefore(m,p)}(document,"script","https://chimpstatic.com/mcjs-connected/js/users/eaea39b6442dc4e0d08e6aa4a/208cb1a4b431cae38b54bdb6f.js");</script> <!--Optimize with GTM and GA includes page--> <style>.async-hide { opacity: 0 !important} </style> <script> (function(a,s,y,n,c,h,i,d,e){s.className+=' '+y;h.start=1*new Date; h.end=i=function(){s.className=s.className.replace(RegExp(' ?'+y),'')}; (a[n]=a[n]||[]).hide=h;setTimeout(function(){i();h.end=null},c);h.timeout=c; })(window,document.documentElement,'async-hide','dataLayer',4000, {'GTM-PXVRTFR':true}); </script> <script> (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){ (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o), m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m) })(window,document,'script','https://www.google-analytics.com/analytics.js','ga'); ga('create', 'UA-2382644-4', 'auto'); // Update tracker settings ga('require', 'GTM-PXVRTFR'); // Add this line </script> <link rel="preload" href="/stylesheets/vendor/bootstrap-3.0.3/fonts/glyphicons-halflings-regular.woff" as="font" crossorigin="anonymous"/> <link rel="preload" href="/stylesheets/fonts/icomoon.woff" as="font" crossorigin="anonymous"/> <link rel="stylesheet" href="/stylesheets/vendor/bootstrap-3.0.3/bootstrap.min.css"> <!-- Bootstrap core CSS <link href="/stylesheets/vendor/bootstrap-4.0.0/bootstrap.min.css" rel="stylesheet"> --> <link rel="stylesheet" href="/stylesheets/naphome.css" /> <link rel="stylesheet" href="/stylesheets/fonts/icomoon.woff" /> <style> .book-row.row { background: #fff; } .top-rows { padding:20px 10px } .well.rfy-titles { height:100%!important } .well.rfy-titles > .book-tile { padding:15px } .well.rfy-titles > .book-tile { padding:15px } .whitewrapper { -webkit-box-shadow:none*/ -moz-box-shadow: none; box-shadow:none; padding:10px; font-family:'archivo_narrowregular',helvetica,sans-serif; margin-bottom:10px } .whitewrapper.bbt-btn { background:none; color:#336699; border:none; min-height:52px; margin-top:10px } .whitewrapper.bbt-btn:hover { background:none; color:#336699; border:none; } .ww-innerbbt { font-size:16px; top:24px } .ww-innerbbt:hover { border-bottom: 4px solid #1d1646; } .mynap-btn-off { top:11px } .btn-searchhome { float:right; display:inline; width:26%; font-size: 14px; border:none; border-radius:5px; height:52px; text-wrap:suppress; word-break:keep-all; overflow:hidden } .icon-search { font-size:18px; } .col-xs-1, .col-sm-1, .col-md-1, .col-lg-1, .col-xs-2, .col-sm-2, .col-md-2, .col-lg-2, .col-xs-3, .col-sm-3, .col-md-3, .col-lg-3, .col-xs-4, .col-sm-4, .col-md-4, .col-lg-4, .col-xs-5, .col-sm-5, .col-md-5, .col-lg-5, .col-xs-6, .col-sm-6, .col-md-6, .col-lg-6, .col-xs-7, .col-sm-7, .col-md-7, .col-lg-7, .col-xs-8, .col-sm-8, .col-md-8, .col-lg-8, .col-xs-9, .col-sm-9, .col-md-9, .col-lg-9, .col-xs-10, .col-sm-10, .col-md-10, .col-lg-10 { position: relative; min-height: 1px; padding-left: 10px; padding-right: 10px; } /*Carousel Styles*/ .img-responsive,.thumbnail>img,.thumbnail a>img,.carousel-inner>.item>img,.carousel-inner>.item>a>img { display:block; width: auto !important; height:auto } .ft h4 { font-family: 'lato', helvetica, sans-serif; font-size: 15px; color: #666; height: 70px; padding-top: 20px; } @media screen and (max-width:556px) { .btn-searchhome { border-radius:4px; height:43px } .hidden-xxs { display:none } } @media screen and (min-width:768px) { .carousel-control .glyphicon-chevron-left,.carousel-control .glyphicon-chevron-right,.carousel-control .icon-prev,.carousel-control .icon-next { width:30px; height:30px; margin-top:-15px; margin-left:-0px; font-size:30px } .carousel-indicators { bottom:0 } } @media screen and (max-width: 768px) { .ww-innerbbt { font-size:18px; top:18px } .mynap-btn-off { top:2px } .well.rfy-titles > .book-tile { padding:20px } h4.rfymore { height:40px; margin-bottom:0 } .icon-search { font-size:23px!important } .btn-searchhome { border-radius:4px; height:48px } .carousel-caption h1 { color: #fff; margin-bottom: 20px; font-size: 2.2rem; } } .page-header .page-header__title { color:#222; color:var(--color-neutral--charcoal); font-size:1.78rem; font-weight:900; font-weight:var(--lato--black); margin-bottom:1.5rem; max-width:100% } .page-header__description { font-size: 1.3em; line-height: 1.75; } .sub-footer { background: #fff; background-image: linear-gradient(180deg, #f3f1eb 0, rgba(243,241,235,0) 250px); padding: 30px 0px 30px 0px; } #email { width: 98%; } .nav-wrap { margin: 50px auto; background-color: transparent; border-top: 1px solid rgb(204,204,204); border-bottom: none; } #local-nav-nap { margin: 0 auto; list-style: none; position: relative; width: 100%; } #local-nav-nap li { display: inline; } #local-nav-nap li a { color: rgb(51,51,51); color: var(--color-neutral--jet); display: block; font-size: 12px; font-weight: 700; min-width: 3em; max-width: 200px; padding: 1.5em 2.2em; position: relative; text-align: center; text-decoration: none; text-transform: uppercase; transition: color .15s; white-space: nowrap; float: left; } #local-nav-nap li a:hover { color: #1d1646; } #magic-line { position: absolute; bottom: -2px; left: 0; width: 100px; height: 7px; background: #1d1646; } .local-nav { border-color: rgb(204,204,204); border-color: var(--color-neutral--pastel); border-width: 1px 0 0; display: -webkit-flex; display: flex;local-nav-nap -webkit-justify-content: flex-start; justify-content: flex-start; max-width: 100%; padding-top: .4rem; } .local-nav__link { color: rgb(51,51,51); color: var(--color-neutral--jet); display: block; font-size: 12px; font-weight: 400; min-width: 4rem; max-width: 200px; padding: .75rem 1.75rem; position: relative; text-align: center; text-decoration: none; text-transform: uppercase; transition: color .15s; white-space: nowrap; } .local-nav__link.is-active::after, .local-nav__link.is-hovered::after { background-color: #1d1646; } .local-nav__link::after { content: ""; background-color: transparent; display: block; height: 7px; left: -2px; position: absolute; top: -1em; transition: background-color .15s; width: 101%; } .prepubbanner { bottom: 23px; } </style> <style> /*share links*/ .social-share .social-share--title { color: #211747; font-size: 1rem; font-weight: 900; letter-spacing: .1rem; margin-right: .6rem; text-transform: uppercase; } .social-share { -webkit-align-items: center; align-items: center; display: -webkit-flex; display: flex; -webkit-flex-wrap: wrap; flex-wrap: wrap; } .social-share svg { fill:#4148c2; margin:0 .1rem; width:auto; height: 25px; } .social-share--networks a:hover { text-decoration: none !important; } .book-row.row { background: #f3f1eb; margin-bottom: 20px; } .external-links-list button.cp-accordion { font-size: 10px; color: #333; border-bottom: 0px; font-weight: 100; text-transform: uppercase; padding: 0px; padding-top: 5px; background: transparent; display: block } .cp-accordion.link-desc-btn:before { content: '\002B'; color: #4148C2; font-weight: bold; margin-right: 10px; } .cp-accordion.link-desc-btn.active:before { content: "\2212"; color: #336699; } .panel.link-desc { padding-left: 0px; } .link-description { padding-top: 20px; padding-bottom: 20px; } h1.catalog-title { color: #333; margin-bottom: 10px; } h2.catalog-subtitle { font-size: 16px; font-family: 'lato', sans-serif; color: #333; margin-top: 10px; font-weight: 100; } .bookyear { font-size: 14px; padding-bottom: 10px; color: #666; display: inline; } .cp-accordion:before { content: "\2212"; color: #336699; font-weight: bold; margin-right: 5px; } .cp-accordion.active:before { content: '\002B'; color: #336699; } .panel { padding: 0 18px; background-color: white; max-height: 0; overflow: hidden; transition: max-height 0.2s ease-out; margin-bottom: 20px; border: none; border-radius: 4px; -webkit-box-shadow: none; box-shadow: none; } #podcasts { margin-bottom: 20px; } .podcast-title { font-style: italic; margin-bottom: 10px; } h1, h2, h3, { color: black; font-family: "merriweather", Cambria, 'Hoefler Text', 'Liberation Serif', Times, 'Times New Roman', 'serif'; font-weight: bold; } h1 a, h2 a, h3 a { color: #336699; } h2.ft { font-size: 20px; } h3 { font-size: 1.5rem; margin-bottom: 20px; } blockquote { border-left: 1px solid tan; } ul.book-topics { margin-left: 0px; padding-left: 0px; } .book-topics li { border-left: 1px solid tan; margin-bottom: 10px; padding-left: 20px; } .list-circle { list-style: circle; } .list-circle li { margin-bottom: 5px; } .rel-info h2, .rel-info h3, .rel-info h4, .rel-info h5, .rel-info h6 { font-family: 'lato', helvetica, sans-serif; font-weight: 900; margin-bottom: 20px; margin-top: 20px; } .rel-info > .external-links-list a { font-weight: 500 !important; padding-left: 0px; } .rel-info > .external-links-list li { display: block; border: none; padding: 0px 10px 0px 0px; text-indent: 0px; } .rel-info > .resource-list li { display: block; border: none; padding: 0px 10px 0px 0px; } .download-links-list { list-style: none; padding: 0; } .flex-item.rel-info h1:first-of-type { font-size: 12px; font-family: 'lato', helvetica, sans-serif; font-weight: 700; margin-bottom: 20px; margin-top: 0px; color: #333; } .flex-item.rel-info h1 { font-size: 12px; font-family: 'lato', helvetica, sans-serif; font-weight: 700; margin-bottom: 20px; margin-top: 30px; color: #333; } ul.resource-list, ul.external-links-list { list-style: none; padding-left: 0px; margin-left: 0px; margin-bottom: 0px; } /*.rel-info>ul.resource-list li:before, .rel-info>ul.external-links-list li:before { content: "\e65c"; font-family: 'icomoon'; speak: none; margin-right: 5px; color: #336699; opacity: .6; }*/ .external-links-list li { margin-bottom: 15px; max-width: 400px; border-left: 1px solid tan; padding-left: 20px; } .external-links-list li a { } .rel-info h3 { font-size: 12px; } .panel-body h3 { font-size: 1.5rem; font-family: 'lato', helvetica, sans-serif; font-weight: 900; margin-bottom: 20px; border-bottom: 1px solid #ccc; } .citation-string { margin-bottom: 20px; } .citation-string blockquote { font-style: normal} .citation-subheading { font-size: 14px; } .flex-row { display: flex; align-content: space-between; align-items: stretch; justify-content: flex-start; flex-direction: row; position: relative; margin-bottom: 10px; flex: 1; } .row.flex-row-cover { align-content: start; display: flex; align-items: flex-start; } .flex-row-actions { display: flex; align-content: flex-start; align-items: stretch; flex-direction: row; position: relative; flex: 1; } .flex-item.title { max-width: 180px; } @media screen and (min-width: 0px) and (max-width: 1140px) { .flex-item.title { max-width: 100%; } } .flex-item.book { max-width: 180px; } .flex-item.cover, .flex-item.book-details { border: none; background: none; flex: 1; } .flex-item.rel-info { border: none; border-left: 1px solid tan; font-size: 14px; flex: 1; } .flex-item.cover { padding: 0px; flex-basis: 20% } .flex-item.book-details { flex-basis: 70%; padding-right: 20px; padding: 0px 20px 0px 0px; background: none; } .flex-item.rel-info { flex-basis: 30%; border-left: 1px solid tan; max-width: 300px; } .flex-item { margin-top: 20px; border: none; padding: 30px; flex: 1; margin: 10px; width: 96%; max-width: 100%; background-image: linear-gradient(180deg, #f3f1eb 0, rgba(243,241,235,0) 250px); } .flex-item.full-width { width: 100%; text-align: left; font-weight: 500; } .flex-item.bookblock.whitebg { min-width: 70%; } .flex-row.row1.whitebg { margin-bottom: 0px !important; padding: 20px 20px 20px 20px; } .flex-row.row2.whitebg { padding: 0px 20px 20px 20px; } .flex-item.overview { /*background: #f3f1eb;*/ background: #fff; background-image: linear-gradient(180deg, #f3f1eb 0, rgba(243,241,235,0) 250px); } .flex-item p { line-height: 1.75; } .overview p { line-height: 1.75; } .flex-item.toclist { flex: 2; padding: 20px; background: #f3f1eb; } th { text-align: left; font-size: 12px; font-weight: 100; text-transform: uppercase; } .table > thead > tr > th, .table > tbody > tr > th, .table > tfoot > tr > th, .table > thead > tr > td, .table > tbody > tr > td, .table > tfoot > tr > td { padding: 10px; line-height: 1; vertical-align: middle; border-bottom: 1px solid #bdbdbd; } .chapter-page-range { font-weight: bold; white-space: nowrap; } .flex-item.searchob { flex: 1; padding: 20px; background: #f3f1eb; } /*Hide Search Text on button*/ .searchob .hidden-xxs { display: none; } #resources.flex-item { min-width: 30%; padding: 20px; background: #f3f1eb; } .book-actions { margin-top: 35px; } .book-actions.flex-row-btnbuy { align-content: flex-start; display: flex; flex-wrap: wrap; align-items: space-between; } .btn-buy-top { display: inline-block; margin: 5px; font-size: 12px; } .btn-buy-top > .btn.btn-link { font-size: 12px; } .smalltxt { color: #504E4E; font-size: 12px; margin-top: 10px; } .old-price { color: #666; font-size: 11px; } .custom-select { display: inline-block; max-width: 100%; height: calc(3.25rem + 2px); padding: .375rem 1.75rem .375rem .75rem; line-height: 1.25; color: #464a4c; vertical-align: middle; background: #fff url("data:image/svg+xml;charset=utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 4 5'%3E%3Cpath fill='%23333' d='M2 0L0 2h4zm0 5L0 3h4z'/%3E%3C/svg%3E") no-repeat right .75rem center; background-size: auto auto; -webkit-background-size: 8px 10px; background-size: 8px 10px; border: 1px solid rgba(0, 0, 0, .15); border-radius: .25rem; -moz-appearance: none; } .heading-rows, .middle-rows { padding: 20px 10px; color: black; min-height: 250px; background: #F3F1EB; margin-top: 0px; } .middle-rows { padding: 20px 10px; color: black; min-height: 250px; background: #fff; margin-top: 0px; } .whitebg { background: #fff; max-width: 100%; } .tanbg { padding: 20px; background: #F3F1EB; width: 100%; margin-top: 30px; } #cover { max-width: 300px; min-width: 100px; position: relative; padding: 0px 10px 0px 10px; } .prepubbanner { position: absolute; background-color: rgba(236, 204, 28, 0.8); color: #fff; text-align: center; left: 0; right: 0; bottom: 20px; padding: 4px; z-index: 19; width: 100%; margin: auto; } .cover-zoom { position: absolute; top: 0; left: 10px; width: 93%; color: white !important; padding: 20px 5px; border-radius: 4px; background: rgba(0, 0, 0, .5); border: 1px solid #fff; text-align: center; height: 100%; display: none; } .cover-block:hover .cover-zoom { display: block; cursor: pointer; } .cover-zoom p { padding-top: 3px; } .cover-it { margin: 0px auto 5px auto; ; display: flex; flex-direction: column; align-content: flex-start; } .cover-zoom .cover-button { margin: auto; color: white; background: rgba(58, 133, 179, 1); padding: 10px; border-radius: 4px; flex: 1; } .cover-button:hover { background: #052c44; } .cover-button > a { color: white; } .cover-button > a:hover { color: #fff; text-decoration: none; } .cover-zoom .glyphicon.glyphicon-zoom-in { font-size: 2rem; opacity: 1.0; display: block; } .cover-zoom .glyphicon.glyphicon-book { font-size: 2rem; opacity: 1.0; display: block; color: #efefef; } #myCover img { margin: auto auto; } #resourceblock { color: black; font-weight: 500; } #resourceblock ul { list-style: none; margin-left: 0px; padding-left: 0px; padding-top: 10px; } #resourceblock ul li { list-style: none; margin-left: 0px; padding: 0px 5px 5px 0px; } #titleblock h1 { font-size: 26px; /*! line-height: 1.25; */ margin-bottom: 4px; word-wrap: break-word; max-width: 100%; color: #333; margin-top: 0px; } #contributorblock { margin-bottom: 20px; margin-top: 20px; font-weight: 500; border-top: 1px solid #eae9e9; padding-top: 15px; padding-bottom: 15px; border-bottom: 1px solid #eae9e9; line-height: 1.75; } #contributorblock a { font-weight: 500; } #descriptionblock { margin-bottom: 20px; margin-top: 20px; color: #333; font-size: 1.567rem; line-height: 1.75; font-weight: 400; text-rendering: optimizeLegibility; } #descriptionblock ul, #descriptionblock ol { list-style: inherit; } #bookoverviewtop { max-width: 100%; min-width: 10%; } .resource-list li { text-indent: 0px; padding-left: 20px; display: block; border: 1px solid #ccc; padding: 10px; margin-right: 5px; border-radius: 5px; white-space: nowrap; margin-bottom: 10px; max-width: 518px; } .resource-list li a { white-space: normal; } @media screen and (max-width: 768px) { .flex-row { display: flex; align-content: space-between; align-items: stretch; justify-content: flex-start; flex-direction: column; position: relative; margin-bottom: 10px; flex: 1; } .flex-row.row2 { display: flex; align-content: space-between; align-items: stretch; justify-content: flex-start; flex-direction: row; position: relative; margin-bottom: 10px; flex: 1; } .resource-list li { text-indent: 0px; padding-left: 20px; display: block; border: 1px solid #ccc; padding: 10px; margin-right: 5px; border-radius: 5px; white-space: nowrap; margin-bottom: 10px; } } #resourceblock h4 { font-family: "lato", sans-serif; font-weight: bold; font-size: 14px; } #statusblock { position: absolute; top: -10px; left: 0px; } #actions { position: absolute; right: 0px; top: -10px; } .btn-tool { display: inline; padding: 5px; background: #fff; margin-right: 3px; } a.btn-tool { color: #336699; font-size: 12px; padding-left: 25px; position: relative; } a.btn-tool.email-this { color: #4148C2; font-size: 12px; padding-left: 0px; position: relative; } .link-tools { display: flex; } .tooltip-inner { max-width: 300px; padding: 2rem; text-align: left; background-color: #333; color: #fff; border-radius: 0rem; } .report-type { font-size: 14px; font-weight: 400; padding-left: 10px; } .report-type:before { font-family: 'icomoon'; speak: none; content: "\e65a"; margin-right: 5px; color: #bc9b6a; opacity: .6; } .lt-addmynap-on, .lt-embed { color: #336699; position: absolute; left: 5px; top: 5px; } .lt-addmynap-off { color: green; position: absolute; left: 5px; top: 5px; } .btn-clear { border: 1px solid #4148C2; border-radius: 4px; } .alert-info { color: #333; } .alert { padding: 15px; margin-bottom: 20px; background-color: #d9edf7; border-color: #a7d5de; border-radius: 4px; } .row-title.ft { padding-bottom: 10px; font-size: 1.25em; line-height: 1.25; border-bottom: 0px; } .book-tile h4 { font-family: "lato", helvetica, sans-serif; font-size: 14px; } .panel-body { padding: 20px 40px; border-top: none; } #stats { padding: 40px; background-image: linear-gradient(180deg, #f3f1eb 0, rgba(243,241,235,0) 250px); } .panel-default > .panel-heading { padding: 20px; background: #9ec0d5; } .panel-group .panel-heading + .panel-collapse .panel-body { border: none; } .panel-heading.cp-accordion-toggle.collapsed.in:after { content: "\2796"; } .cp-accordion { font-size: 20px; font-weight: 900; } h4.panel-title { font-family: 'lato'; font-weight: 700; font-size: 1.3em; line-height: 1; } .panel-heading .cp-accordion-toggle:after { content: "\2796"; /* Unicode character for "minus" sign (-) */ font-size: 13px; color: #777; float: right; margin-left: 5px; } .panel-heading .cp-accordion-toggle.collapsed:after { /* symbol for "collapsed" panels */ content: '\02795'; /* adjust as needed, taken from bootstrap.css */ } .cp-accordion-toggle.collapsed.in:after { content: "\2796"; } .chapter-name a { font-weight: 500; line-height: 1.5; } /*Responsive Video Embed*/ .videoWrapperOuter { max-width: 640px; margin-left: auto; margin-right: auto; margin-bottom: 20px; } .video.videoWrapperOuter h4 { font-size: 16px; font-family: 'lato', sans-serif; font-weight: 900; } .videoWrapperInner { float: none; clear: both; width: 100%; position: relative; padding-bottom: 50%; padding-top: 25px; height: 0; } .videoWrapperInner iframe { position: absolute; top: 0; left: 0; width: 100%; height: 100%; } h4.videoTitle { font-size: 14px; font-family: 'lato', helvetica; color: #666; } .icon-skim { color: #4148C2; margin-right: 6px; } .graysearchouter { border: 1px solid #ccc; margin-bottom: 30px; background: #fff; height: 45px; } blockquote { text-align: left !important; } .citation-formats { display: inline-flex; align-content: stretch; align-items: flex-start; justify-content: flex-start; margin-left: 0px; padding-left: 0px; list-style: none; flex-wrap: wrap; } .citation-formats li { max-width: 100%; width: 168px; margin-bottom: 5px; margin-right: 5px; } .citation-formats li a { font-size: 12px; font-weight: 500; letter-spacing: 1px; display: block; border: 1px solid #4148C2; border-radius: 4px; padding: 8px; margin-right: 3px; word-wrap: nowrap; white-space: nowrap; width: 100%; } .citation-formats li a:hover { background: #4148C2; color: white; text-decoration: none; } .citation-formats li a:before { content: "\e75c"; font-family: 'icomoon'; speak: none; margin-right: 5px; color: #4148C2; opacity: .6; } h3.citation-subheading { border-bottom: 0px; color: #565555; font-size: 14px; } h3 { font-size: 14px; margin-bottom: 20px; font-weight: 700; color: #333; text-transform: uppercase; } .embargo-row { padding: 1rem; background: #eed9d9; text-align: center; } .mynap-promo { padding: 10px; margin-bottom: 20px; background: #efefef; border: 1px solid #ccc; border-radius: 4px; } .mynap-promo.visible-xs.visible-sm { padding: 10px; background: #fff; margin: 10px 0px; } @media screen and (max-width: 500px) { .flex-row.row2 { display: flex; align-content: space-between; align-items: stretch; justify-content: flex-start; flex-direction: row; position: relative; margin-bottom: 10px; flex: 1; flex-wrap: wrap; } .flex-row-cover { flex-direction: column; } #titleblock h1 { font-size: 18px; line-height: 22px; margin: 0px; word-wrap: break-word; max-width: 100%; } .btn { text-align: left; white-space: wrap !important; font-size: 16px; width: 100%; } .btn-buy-top { width: 100%; } } @media screen and (max-width: 768px) { .flex-item.rel-info { display: none; max-width: 100%; } .container { padding: 0px; } .panel-body { padding: 0px; } .flex-item.searchob, .flex-item.toclist { width: 97%; } } @media screen and (max-width: 980px) { .flex-item.rel-info { max-width: 100%; } } </style> <style>pre { background-color: transparent !important; }</style> </head> <body> <!-- Google Tag Manager (nos cript) --> <noscript><iframe src="https://www.googletagmanager.com/ns.html?id=GTM-N9MJ23" height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript> <!-- End Google Tag Manager (noscript) --> <a name="top" id="top"></a> <a href="#content" class="sr-only sr-only-focusable">Skip to main content</a> <style> body { overflow-x: hidden; } #lowerMenu { background: #fff } .global-nav--local .mega-menu { display: block; -webkit-transform: translateY(0em); transform: translateY(0em); } .global-nav--local.search-is-hidden .mega-menu { display: none; -webkit-transform: translateY(0em); transform: translateY(0em); } .global-nav .container:not(.mega-menu__header) { padding: 0rem; padding-top: 0rem; padding-right: 0rem; padding-top: 0.5rem; padding-right: 1rem; } .global-nav__controls { top: .3rem; padding-right: 20px; } .global-nav--local .global-nav__links { -webkit-transform: translateY(0); transform: translateY(0); max-width: 75%; float: right; background: #fff; } .global-nav__links ul { display: -webkit-flex; display: flex; -webkit-justify-content: flex-end; justify-content: flex-end; margin-top: .5rem; } .global-nav--local.menu-is-hidden .global-nav__links { opacity: 0; -webkit-transform: translateY(0.5em); transform: translateY(0.5em); visibility: hidden; } #header-large { max-width: 1180px; margin: 0; padding: 0 0; -webkit-box-shadow: none; -moz-box-shadow: none; box-shadow: none; flex-wrap: nowrap; position: absolute; top: 113px; text-align: right; width: 100%; right: 0; } #header-large .user-links { white-space: nowrap; display: inline-flex; margin: 0; padding: 0; background: #fff; z-index: 0; list-style: none; min-width:500px; } .user-links li { margin-right: 7%; } .user-links li a { font-size: 10px; text-align: left; text-transform: uppercase; color: #000; } #header-large a.site-links { margin-right: 15px; color: #000; padding-left: 0px; padding-right: 5px; font-size: 12px; text-transform: uppercase; } .site-links:hover { text-decoration: underline; } nav#sitelinks-wide { position: absolute; top: 16px; } #sitelinks-wide ul { display: flex; justify-content: space-between; margin: 0; padding: 0; } #sitelinks-wide ul li { #sitelinks-mobile { display: none; } white-space: nowrap; } #sitelinks-mobile { display: none; } .user-links li a:hover { text-decoration: underline; } .dropdown-menu { position: absolute; top: 100%; left: 10px; z-index: 9999999; display: none; float: left; min-width: 160px; padding: 5px 0; margin: 2px 0 0; list-style: none; font-size: 14px; background-color: #ffffff; border: 1px solid #cccccc; border: 1px solid rgba(0, 0, 0, 0.15); border-radius: 4px; -webkit-box-shadow: 0 6px 12px rgba(0, 0, 0, 0.175); box-shadow: 0 6px 12px rgba(0, 0, 0, 0.175); background-clip: padding-box; } #dropdownMenuButton { border: 1px solid #ccc; font-size: 14px; font-weight: 700; } .dropdown #dropdownMenuButton:after { content: '\02795'; /* Unicode character for "plus" sign (+) */ font-size: 13px; color: #777; float: right; margin-left: 5px; } .dropdown.open #dropdownMenuButton:after { content: "\2796"; /* Unicode character for "minus" sign (-) */ } li.naphelp { display: block;} @media (max-width: 930px) { #header-large { right: 80px; } #header-large .user-links { min-width:100px; } nav#sitelinks-wide { display: none; } #sitelinks-mobile { display: block; position: absolute; top: -10px; left: 107px; } #sitelinks-wide ul { display: block; } #sitelinks-wide ul li { margin-right: 0%; white-space: nowrap; } .dropdown-item { display: block; width: 100%; padding: .25rem 1.5rem; clear: both; font-weight: 400; color: #212529; text-align: inherit; white-space: nowrap; background-color: transparent; border: 0; text-align: left; } .dropdown.nap-mega-menu.mega-dropdown { display: none;} li.naphelp { display: none;} } .global-nav__links { display: none; opacity: 1; transition: opacity .15s, -webkit-transform .15s; transition: opacity .15s, transform .15s; transition: opacity .15s, transform .15s, -webkit-transform .15s; } .global-nav--local .global-nav__links { -webkit-transform: translateY(0); transform: translateY(0); } .global-nav--local.menu-is-hidden .global-nav__links { opacity: 0; -webkit-transform: translateY(0.5em); transform: translateY(0.5em); } .global-nav__links ul { display: -webkit-flex; display: flex; -webkit-justify-content: flex-end; justify-content: flex-end; margin-top: 1rem; } .global-nav__links li:hover .global-nav__link>span::before, .global-nav__links li:focus-within .global-nav__link>span::before, .global-nav__links .global-nav__link.is-active>span::before, .global-nav__links .global-nav__link:hover>span::before, .global-nav__links .global-nav__link:focus>span::before { background-color: #1C143D; ; } .global-nav__links li:hover .global-nav__link>span::before::after, .global-nav__links li:focus-within .global-nav__link>span::before::after, .global-nav__links .global-nav__link.is-active>span::before::after, .global-nav__links .global-nav__link:hover>span::before::after, .global-nav__links .global-nav__link:focus>span::before::after { opacity: 1; } @media screen and (min-width: 65em) { .global-nav__links { display: block; } .global-nav__links>ul>li:last-of-type .global-nav__link { margin-right: -1.25em; } } .global-nav__link { position: relative; display: block; padding: .75em 1.5em .5em; color: rgb(34, 34, 34); color: var(--color-neutral--charcoal); border-bottom: 5px solid transparent; /*font-size: .885rem;*/ font-weight: 700; font-weight: var(--lato--bold); text-decoration: none; transition: color .15s; } .global-nav__link>span { position: relative; } .global-nav__link>span::before { content: ""; position: absolute; bottom: -.5em; left: 0; width: 100%; height: 5px; background-color: transparent; transition: background-color .15s; } .global-nav__dropdown { position: absolute; top: calc(100% + 1em); left: 50%; display: none; width: 600px; background-color: rgb(255, 255, 255); background-color: var(--color-neutral--white); box-shadow: 0 5px 15px rgba(34, 34, 34, .25); box-shadow: 0 5px 15px var(--box-shadow--charcoal); -webkit-transform: translateX(-50%); transform: translateX(-50%); z-index: 20; } .global-nav__dropdown::before { content: ""; position: absolute; top: -1em; left: 0; display: block; width: 100%; height: 1em; } .global-nav__dropdown .dropdown__left { position: relative; min-height: 260px; width: 40%; padding: 1.5rem; background: rgb(255,255,255); background: -moz-linear-gradient(180deg, rgba(255,255,255,1) 0%, rgba(73,69,104,1) 0%, rgba(0,0,0,1) 100%, rgba(195,228,228,1) 100%); background: -webkit-linear-gradient(180deg, rgba(255,255,255,1) 0%, rgba(73,69,104,1) 0%, rgba(0,0,0,1) 100%, rgba(195,228,228,1) 100%); background: linear-gradient(180deg, rgba(255,255,255,1) 0%, rgba(73,69,104,1) 0%, rgba(0,0,0,1) 100%, rgba(195,228,228,1) 100%); filter: progid:DXImageTransform.Microsoft.gradient(startColorstr="#ffffff",endColorstr="#c3e4e4",GradientType=1); } .global-nav__dropdown .dropdown__left a { display: block; color: rgb(255, 255, 255); color: var(--color-neutral--white); font-weight: 400; font-weight: var(--lato--regular); transition: color .15s; font-size: 16px; } .global-nav__dropdown .dropdown__left a:hover, .global-nav__dropdown .dropdown__left a:focus, .global-nav__dropdown .dropdown__left a:active { color: rgb(246,210,0); color: var(--color-yellow--pure); } .global-nav__dropdown .dropdown__left ul { -webkit-flex-direction: column; flex-direction: column; } .global-nav__dropdown .dropdown__left li a { padding: .5em 0; line-height: 1.4; } .global-nav__dropdown .dropdown__left--default { position: absolute; top: 0; right: 0; bottom: 0; left: 0; overflow: hidden; background-color: rgb(243, 241, 235); background-color: var(--color-brown--bone); } .global-nav__dropdown .dropdown__left--default img { width: 100%; height: auto; /* stylelint-disable max-nesting-depth */ /* stylelint-enable max-nesting-depth */ } @supports (object-fit: cover) { .global-nav__dropdown .dropdown__left--default img { height: 100%; object-fit: cover; } } .global-nav__dropdown .dropdown__right { width: 60%; padding: 1.5rem; } .global-nav__dropdown .dropdown__right .button { margin-top: 2em; text-shadow: none; } .global-nav__dropdown .dropdown__right a { color: rgb(0, 89, 145); color: var(--color-blue--bahama); text-decoration: none; transition: color .15s; } .global-nav__dropdown .dropdown__right a:hover, .global-nav__dropdown .dropdown__right a:focus { color: rgb(33,23,71); color: var(--color-blue--imperial); text-decoration: underline; } .rm-dropdown:hover::after, .rm-dropdown:focus::after { visibility: hidden; } .has-dropdown { position: relative; } .has-dropdown::after { content: ""; position: absolute; top: calc(100% + 3px); left: 50%; width: 26px; height: 15px; background-image: url(data:image/png;base64,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); background-repeat: no-repeat; -webkit-transform: translateX(-50%); transform: translateX(-50%); visibility: hidden; } .has-dropdown:hover::after, .has-dropdown:focus::after { visibility: visible; } .has-dropdown:hover .global-nav__dropdown { display: -webkit-flex; display: flex; } .has-dropdown:focus-within .global-nav__dropdown { display: -webkit-flex; display: flex; } .has-dropdown:nth-last-of-type(-n+3) .global-nav__dropdown { left: auto; -webkit-transform: none; transform: none; } .has-dropdown:nth-last-of-type(3) .global-nav__dropdown { right: -200%; } .has-dropdown:nth-last-of-type(2) .global-nav__dropdown { right: -90%; } .has-dropdown:last-of-type .global-nav__dropdown { right: 5%; } .global-nav__links { z-index: 5; } header.global-nav { height: 150px; } .button.button--secondary.button--outline.button--icon { font-size: 12px; padding-right: 40px; } .button.button--icon svg { height: 2.5em; position: absolute; top: 50%; left: 60%; -webkit-transform: translate(-50%, -50%); transform: translate(-50%, -50%); width: 24px; } .controls__search, .controls__menu, .controls__nav { font-size: 12px; } .global-nav__menus--upper { display: -webkit-flex; display: flex; -webkit-justify-content: space-between; justify-content: space-between; margin-bottom: 2rem; } .global-nav__link { font-size: 16px; } .global-nav__links ul { display: -webkit-flex; display: flex; -webkit-justify-content: flex-end; justify-content: flex-end; margin-top: 5px; list-style: none; } .invert { background: #000; color: #fff; } .controls__nav .menu-off { display: inline; } .controls__nav .menu-on { display: none; } .controls__nav.invert .menu-off { display: none } .controls__nav.invert .menu-on { display: inline; } .mega-menu { background-color: rgb(243, 241, 235); background-color: var(--color-brown--bone); position: fixed; top: 0; right: 0; bottom: 0; left: 0; overflow: scroll; z-index: 9999999; } .mega-menu .mega-menu__header { display: -webkit-flex; display: flex; -webkit-justify-content: space-between; justify-content: space-between; -webkit-align-items: center; align-items: center; padding-top: 1rem; } .mega-menu__content .search-form__container { position: relative; max-width: 70em; margin: 0 auto; } #search .global-nav__logo { position: absolute; top: 1em; } .sf-top { margin-top: 50px; } #searchFormNAP { display: block; height: 100px; } a:hover, a:focus { color: #1C143D; text-decoration: underline; } #fixedfooter a:hover, #fixedfooter a:focus { color: #fff; text-decoration: underline; } .btn-blueflat.btn-searchhome.hide-xs { display: none; } .mega-menu__content { margin-top: 50px; margin-left: 7px; } .accordion__title.faq__accordion__title .flex.justify-between { display: inherit; } .global-nav__logo { margin: 0px !important; position: absolute; left: 15px; top: 25px; height: 55px; } .global-nav__link:hover { text-decoration: none; } @media screen and (min-width: 65em) { .mega-menu__content .search-form { padding: 1em 0px 3em 0em; } } @media (min-width: 45rem) { .global-nav__logo {} } @media (max-width: 480px) { .global-nav__logo { margin: 0px !important; position: absolute; left: 15px; top: 12px; } } /* Style the buttons that are used to open and close the accordion panel */ #mobile-menu button.accordion, #mobile-menu button.no-accordion { letter-spacing: 1px; text-align: left; color: #4148C2; font-size: 1.1em; font-weight: 700 !important; font-family: 'lato', helvetica, sans-serif; padding: 15px 0px 15px 0px; border-top: none !important; border-bottom: .5px solid rgb(221, 213, 199) !important; cursor: pointer; width: 100%; } .mega-menu__content .accordion { border: 0; font-weight: 700; } #mobile-menu .accordion:after { content: '\02795'; /* Unicode character for "plus" sign (+) */ font-size: 13px; color: #777; float: right; margin-left: 5px; } #mobile-menu button.active:after { content: "\2796"; /* Unicode character for "minus" sign (-) */ } /* Add a background color to the button if it is clicked on (add the .active class with JS), and when you move the mouse over it (hover) */ #mobile-menu button.active, #mobile-menu button.accordion:hover { background-color: transparent; } /* Style the accordion panel. Note: hidden by default */ #mobile-menu .panel { padding: 0 0; background-color: transparent; max-height: 0; box-shadow: 0 !important; overflow: hidden; transition: max-height 0.2s ease-out; margin: 0px !important; border: 0 !important; } #mobile-menu .panel ul li { margin: 0px 0px; padding-left: 0px; } #mobile-menu .panel ul { margin-top: 10px; margin-bottom: 10px; padding-left: 0px; } #mobile-menu .panel ul li { line-height: 2; } #mobile-menu .panel ul li a { color: #000; text-decoration: underline; cursor: pointer; } .controls__menu-mobile { text-transform: uppercase; } .controls__menu-mobile svg { fill: #222; fill: var(--color-neutral--charcoal); width: 1.75rem; height: 1.75rem; } .cart-badge { display: inline-block; text-align: center; line-height: 1; background: #7899F2; color: white; font-weight: bold; border-radius: 20px; padding: 3px 6px; margin-left: 3px; } @media screen and (min-width: 65em) { #mobile-menu .controls__menu { display: inline; } } @media screen and (max-width: 65em) { #mobile-menu .controls__menu svg { display: inline; } } /*NAP mega menu dropdown*/ li.nap-mega-menu.mega-dropdown { position: static !important; width:100% !important; } .nap-mega-menu .mega-dropdown-menu { padding: 20px 0px; box-shadow: none; -webkit-box-shadow: none; margin-top: 10px !important; box-shadow: 0 5px 15px var(--box-shadow--charcoal); transform: none !important; top: 100% !important; } .nap-mega-menu .mega-dropdown-menu > li > ul.browse-col { padding: 0; margin: 0; width: 100%; } .nap-mega-menu .mega-dropdown-menu > li > ul > li { list-style: none; } .nap-mega-menu .mega-dropdown-menu > li > ul > li > a { display: block; padding: 3px 20px; clear: both; font-weight: normal; line-height: 1.428571429; color: #4148C2; white-space: normal; font-size: 14px; text-transform: none; } .nap-mega-menu .mega-dropdown-menu > li ul > li > a:hover, .nap-mega-menu .mega-dropdown-menu > li ul > li > a:focus { text-decoration: none; color: #444; background-color: #f5f5f5; } .nap-mega-menu .mega-dropdown-menu .dropdown-header a { color: #4148C2; font-size: 14px; font-weight: 900 !important; text-align: left; text-transform: uppercase !important; padding: 0px; margin-bottom: 7px; } .nap-mega-menu .mega-dropdown-menu form { margin:3px 20px; } .nap-mega-menu .mega-dropdown-menu .form-group { margin-bottom: 3px; } .nap-mega-menu .vertical-divider { border-left: 1px solid #ccc; } .nap-mega-menu .mega-dropdown-menu > li.d-flex { display: inline-flex !important; margin-right: 0 !important; justify-content: space-between; flex-wrap: nowrap !important; flex-direction: row !important; } #nap-mega-menu-inner { justify-content: space-between; align-content:start; } #nap-mega-menu-inner li.browse-col { width: 22%; } </style> <header class="global-nav global-nav--local menu-is-hidden search-is-hidden" id="lowerMenu"> <div class="container flex justify-between"> <!--Mega menu start --> <div aria-hidden="true" class="mega-menu" id="search"> <div data-lock=""> <div class="container mega-menu__header"> <div class="global-nav__logo"> <a class="navbar-brand js-scroll-trigger" href="https://www.nationalacademies.org/"> <svg xmlns="http://www.w3.org/2000/svg" id="nasemLogo" data-name="nasemLogo" viewBox="0 0 360 66.64"> <defs/> <path d="m4.26 8.63 19.56 20.49V1.72h-3.47v18.93L.8.16v27.32h3.46V8.63zM32.55 27.48h3.83l8.15-19.2 7.93 18.99.09.21h3.82L44.62 0 32.55 27.48zM175.05 27.48h3.83l8.16-19.2 7.93 18.99.08.21h3.83L187.12 0l-12.07 27.48zM68.23 27.48h3.47V5.03h7.72V1.72H60.51v3.31h7.72v22.45zM90.08 1.72h3.46v25.76h-3.46z" class="cls-2"/> <path d="M157.14 38.67A13.39 13.39 0 1 0 143.75 52a13.21 13.21 0 0 0 13.39-13.33Zm-3.54 0a9.85 9.85 0 1 1-9.85-10 9.93 9.93 0 0 1 9.85 10Z" class="cls-2" transform="translate(-24.97 -24.05)"/> <path d="m146.56 8.63 19.56 20.49V1.72h-3.47v18.93L143.1.16v27.32h3.46V8.63zM210.95 1.72h-3.46v25.76h13.8v-3.31h-10.34V1.72z" class="cls-2"/> <path d="M67.41 63A13.13 13.13 0 0 0 54 76.37a13 13 0 0 0 13.26 13.24A13.48 13.48 0 0 0 75 87.1l.14-.1v-4.46l-.58.58a10.91 10.91 0 0 1-2.81 2 10 10 0 0 1-4.51 1.13c-6.74 0-9.77-5.78-9.77-9.89a9.82 9.82 0 0 1 9.74-10.11 10.44 10.44 0 0 1 4.18.94 12 12 0 0 1 3.17 2.27l.58.58v-4.41l-.13-.1a12.1 12.1 0 0 0-7.6-2.53ZM130 66.4a14 14 0 0 0-9.47-3h-5.45v25.75h5.42c4.25 0 6.88-.83 9.39-3a12.32 12.32 0 0 0 4.52-9.89A12.54 12.54 0 0 0 130 66.4Zm-2.39 17.26a10.37 10.37 0 0 1-7 2.18h-2.11V66.7h2.11c6.21 0 10.22 3.77 10.22 9.59a9.23 9.23 0 0 1-3.25 7.37Z" class="cls-2" transform="translate(-24.97 -24.05)"/> <path d="M119.94 65.11h15.33V61.8h-11.86v-9.07h10.38v-3.31h-10.38v-6.76h11.86v-3.32h-15.33v25.77zM201.26 65.11h15.33V61.8h-11.86v-9.07h10.37v-3.31h-10.37v-6.76h11.86v-3.32h-15.33v25.77zM158.66 58.65l-9.79-21.53-4.42 27.99h3.56l2.36-16.59 8.25 18.12 8.35-18.12 2.25 16.59h3.56l-4.14-28.03-9.98 21.57zM184.29 39.34h3.46V65.1h-3.46z" class="cls-2"/> <path d="M263.7 76.76a12.7 12.7 0 0 0-4-2.44l-2.42-1a8 8 0 0 1-2.53-1.51 2.32 2.32 0 0 1-.83-1.94c0-2.11 1.56-3.53 3.87-3.53a4.18 4.18 0 0 1 2.61.79 5.51 5.51 0 0 1 1.37 1.77l.17.34 2.8-1.85-.14-.27a7.79 7.79 0 0 0-2.56-2.91 7.16 7.16 0 0 0-4.18-1.21c-4.34 0-7.37 2.8-7.37 6.8a5.53 5.53 0 0 0 1.83 4.35 10.74 10.74 0 0 0 3.24 2l2.44 1.17a10.81 10.81 0 0 1 2.94 1.68 3.39 3.39 0 0 1 1.13 2.68A4.8 4.8 0 0 1 254 85a5.6 5.6 0 0 1-1.42-3l-.05-.39-3.4.94.07.32a9.51 9.51 0 0 0 2.43 4.61 7.73 7.73 0 0 0 5.69 2.13 7.9 7.9 0 0 0 8.28-8 6.38 6.38 0 0 0-1.9-4.85Z" class="cls-2" transform="translate(-24.97 -24.05)"/> <path d="M0 65.11h3.83l8.16-19.21 7.92 19 .09.21h3.83L12.07 37.63 0 65.11zM57.37 65.11h3.83l8.15-19.21 7.93 19 .08.21h3.83L69.44 37.63 57.37 65.11z" class="cls-2"/> <path d="M292 26.45a3.91 3.91 0 0 0-1.07-.14 2.94 2.94 0 0 0-1.74.52 1.71 1.71 0 0 0-.72 1.47 2.36 2.36 0 0 0 .63 1.7 9.45 9.45 0 0 0 1.9 1.38 15.52 15.52 0 0 1 1.45 1 4.28 4.28 0 0 1 .94 1.12 2.87 2.87 0 0 1 .38 1.51 3.57 3.57 0 0 1-.57 2 3.79 3.79 0 0 1-1.6 1.34 5.79 5.79 0 0 1-2.39.47 9.63 9.63 0 0 1-2.22-.25 4.15 4.15 0 0 1-1.41-.52l.39-2.49H287l.11 1.84a2.93 2.93 0 0 0 .92.39 5 5 0 0 0 1.16.14 3.39 3.39 0 0 0 2-.6 1.94 1.94 0 0 0 .83-1.68 2.25 2.25 0 0 0-.56-1.54 7.66 7.66 0 0 0-1.7-1.32c-.6-.39-1.1-.75-1.51-1.07a4.43 4.43 0 0 1-1-1.2 2.94 2.94 0 0 1-.43-1.59 3.08 3.08 0 0 1 .57-1.85 3.58 3.58 0 0 1 1.55-1.23 5.17 5.17 0 0 1 2.13-.43 7.84 7.84 0 0 1 2 .21 4 4 0 0 1 1.25.51l-.4 2.31h-.95l-.14-1.68a2.39 2.39 0 0 0-.83-.32ZM300.27 29.79a2.2 2.2 0 0 0-1.53.62 4.15 4.15 0 0 0-1.06 1.74 8 8 0 0 0-.38 2.55 4.11 4.11 0 0 0 .5 2.24 1.6 1.6 0 0 0 1.42.74 2.71 2.71 0 0 0 1.25-.27 5.56 5.56 0 0 0 1.15-.81l.35.64a4.42 4.42 0 0 1-1.31 1.08 3.78 3.78 0 0 1-2 .5 2.76 2.76 0 0 1-2.31-1 4.51 4.51 0 0 1-.83-2.9 7.35 7.35 0 0 1 .6-2.87 6 6 0 0 1 1.77-2.38 4.27 4.27 0 0 1 2.77-.95 5.7 5.7 0 0 1 1.06.11 3.31 3.31 0 0 1 .92.3l-.48 1.7-.29-.11a2.91 2.91 0 0 0-1.6-.93ZM306.13 37.31a.54.54 0 0 0 .08.33.22.22 0 0 0 .2.11.74.74 0 0 0 .39-.12 2.88 2.88 0 0 0 .5-.4l.23.42a3.34 3.34 0 0 1-.78.77 2 2 0 0 1-1.23.4 1.3 1.3 0 0 1-.89-.27.9.9 0 0 1-.26-.81c0-.3.18-1.43.46-3.41q.24-1.59.6-4.23l-1.09-.4.11-.6 2.49-.4.38.19-1.17 8.25Zm-.08-10.8a1 1 0 0 1-.27-.69 1.24 1.24 0 0 1 .34-.89 1.07 1.07 0 0 1 .82-.37.94.94 0 0 1 .7.27.93.93 0 0 1 .26.66 1.35 1.35 0 0 1-.33.92 1.14 1.14 0 0 1-.88.38.9.9 0 0 1-.64-.28ZM315.15 38.24a4.26 4.26 0 0 1-2.23.6 3.45 3.45 0 0 1-2-.53 3.23 3.23 0 0 1-1.15-1.41 4.83 4.83 0 0 1-.36-1.87 7.38 7.38 0 0 1 .67-3.14 5.91 5.91 0 0 1 1.92-2.33 4.33 4.33 0 0 1 2.62-.88 2.64 2.64 0 0 1 1.88.6 2.06 2.06 0 0 1 .63 1.56 2.66 2.66 0 0 1-1 2.11 6.62 6.62 0 0 1-2.37 1.28 9.48 9.48 0 0 1-2.46.45 3.85 3.85 0 0 0 .42 2.13 1.68 1.68 0 0 0 1.6.91 3.61 3.61 0 0 0 1.54-.36 4.41 4.41 0 0 0 1.39-1l.38.65a4.39 4.39 0 0 1-1.48 1.23Zm-2.41-8a4.82 4.82 0 0 0-1 1.65 7.41 7.41 0 0 0-.44 1.94 5.85 5.85 0 0 0 1.86-.39 4.34 4.34 0 0 0 1.6-1 2 2 0 0 0 .65-1.46 1.5 1.5 0 0 0-.33-1.05 1.14 1.14 0 0 0-.88-.35 2 2 0 0 0-1.46.67ZM323.42 29.32a3.62 3.62 0 0 1 2-.64 1.89 1.89 0 0 1 1.51.6 2.93 2.93 0 0 1 .53 1.95 16.77 16.77 0 0 1-.39 2.68l-.07.4-.14.85a12.6 12.6 0 0 0-.28 2.12c0 .32.08.47.23.47a1.35 1.35 0 0 0 .82-.44l.21.46a1.7 1.7 0 0 1-.36.4 2.81 2.81 0 0 1-.7.45 1.92 1.92 0 0 1-.9.2c-.74 0-1.11-.35-1.11-1.07a14.6 14.6 0 0 1 .32-2.14l.16-.84.07-.42c.11-.63.21-1.18.28-1.66a9 9 0 0 0 .1-1.32 2 2 0 0 0-.23-1.12 1 1 0 0 0-.84-.3 2.63 2.63 0 0 0-1.57.69 6.6 6.6 0 0 0-1.48 1.67l-.86 6.34H319l1.13-8.49-.86-.42.14-.67 2.14-.39.37.2-.23 2.1a6.56 6.56 0 0 1 1.73-1.66ZM334.3 29.79a2.22 2.22 0 0 0-1.53.62 4.14 4.14 0 0 0-1 1.74 7.68 7.68 0 0 0-.38 2.55 4.11 4.11 0 0 0 .49 2.24 1.61 1.61 0 0 0 1.42.74 2.78 2.78 0 0 0 1.26-.27 5.52 5.52 0 0 0 1.14-.81l.36.64a4.56 4.56 0 0 1-1.31 1.08 3.85 3.85 0 0 1-2 .5 2.79 2.79 0 0 1-2.31-1 4.57 4.57 0 0 1-.83-2.9 7.19 7.19 0 0 1 .61-2.87 5.94 5.94 0 0 1 1.77-2.38 4.24 4.24 0 0 1 2.76-.95 5.7 5.7 0 0 1 1.06.11 3.2 3.2 0 0 1 .92.3l-.47 1.7-.3-.11a2.91 2.91 0 0 0-1.66-.93ZM343.32 38.24a4.26 4.26 0 0 1-2.23.6 3.42 3.42 0 0 1-1.95-.53A3.17 3.17 0 0 1 338 36.9a4.66 4.66 0 0 1-.37-1.87 7.53 7.53 0 0 1 .67-3.14 6 6 0 0 1 1.86-2.33 4.36 4.36 0 0 1 2.63-.88 2.65 2.65 0 0 1 1.88.6 2.06 2.06 0 0 1 .63 1.56 2.69 2.69 0 0 1-1 2.11 6.66 6.66 0 0 1-2.38 1.28 9.33 9.33 0 0 1-2.46.45 4 4 0 0 0 .42 2.13 1.68 1.68 0 0 0 1.6.91 3.65 3.65 0 0 0 1.55-.36 4.37 4.37 0 0 0 1.38-1l.39.65a4.43 4.43 0 0 1-1.48 1.23Zm-2.4-8a4.67 4.67 0 0 0-1 1.65 7 7 0 0 0-.44 1.94 5.79 5.79 0 0 0 1.85-.39 4.25 4.25 0 0 0 1.6-1 2 2 0 0 0 .65-1.46 1.5 1.5 0 0 0-.32-1.05 1.17 1.17 0 0 0-.89-.35 1.93 1.93 0 0 0-1.45.67ZM351.91 29.91a3.08 3.08 0 0 0-1.24-.24 2.15 2.15 0 0 0-1.3.35 1.18 1.18 0 0 0-.49 1 1.54 1.54 0 0 0 .4 1.06 6.17 6.17 0 0 0 1.13 1c.42.33.76.61 1 .85a3.35 3.35 0 0 1 .67.87 2.38 2.38 0 0 1 .3 1.2 2.4 2.4 0 0 1-1 2.07 4.21 4.21 0 0 1-2.53.73 7.55 7.55 0 0 1-1.57-.17 2.73 2.73 0 0 1-1-.39l.29-1.21a3.77 3.77 0 0 0 1 .5 3.94 3.94 0 0 0 1.36.24 2.47 2.47 0 0 0 1.31-.33 1.14 1.14 0 0 0 .55-1.06 1.58 1.58 0 0 0-.43-1.09 8 8 0 0 0-1.26-1 3.53 3.53 0 0 1-1.81-2.86 2.43 2.43 0 0 1 .46-1.45 2.92 2.92 0 0 1 1.25-1 4.48 4.48 0 0 1 1.75-.34 7.2 7.2 0 0 1 1.29.12 4.56 4.56 0 0 1 .92.22l-.3 1.33a1.83 1.83 0 0 0-.75-.4ZM287 50.81h8.32l-.12 2.79h-1l-.28-1.84-4-.14-.67 5 4.07-.14-.12 1.32-4-.14-.81 5.34 4.95-.21 1-2.12 1 .19-.71 3h-9.33l.07-.68 1.32-.21 1.4-11.19-1.19-.2ZM301.65 54.52a3.52 3.52 0 0 1 2-.64 1.89 1.89 0 0 1 1.51.6 2.89 2.89 0 0 1 .53 1.94 16.85 16.85 0 0 1-.39 2.69l-.07.4-.14.84a12.68 12.68 0 0 0-.28 2.13c0 .31.07.47.23.47a1.41 1.41 0 0 0 .82-.44l.14.49a1.76 1.76 0 0 1-.37.4 3.17 3.17 0 0 1-.69.45 2 2 0 0 1-.9.2A1 1 0 0 1 303 63a14.6 14.6 0 0 1 .32-2.14l.16-.84.07-.42c.11-.64.21-1.19.28-1.66a9.18 9.18 0 0 0 .1-1.33 2 2 0 0 0-.23-1.11 1 1 0 0 0-.84-.31 2.59 2.59 0 0 0-1.57.7 6.6 6.6 0 0 0-1.48 1.67l-.86 6.33h-1.67l1.13-8.49-.86-.42.14-.66 2.14-.39.37.19-.23 2.11a6.56 6.56 0 0 1 1.68-1.71ZM313.74 66.64a4.23 4.23 0 0 1-1.77 1.2 5.86 5.86 0 0 1-2 .37 7.37 7.37 0 0 1-1.13-.09 4.89 4.89 0 0 1-.87-.22l.37-1.42a6.44 6.44 0 0 0 1 .39 4.29 4.29 0 0 0 1.22.18 2.62 2.62 0 0 0 1.66-.43 2.58 2.58 0 0 0 .71-1.62l.33-2.33a4.25 4.25 0 0 1-1.18 1 3 3 0 0 1-1.52.39 2.52 2.52 0 0 1-2.17-1 4.5 4.5 0 0 1-.72-2.68 7.33 7.33 0 0 1 .66-3 6.45 6.45 0 0 1 1.95-2.49 4.73 4.73 0 0 1 3-1 5.1 5.1 0 0 1 1 .11 5.19 5.19 0 0 1 .91.28l1.09-.39-1.58 10.63a3.73 3.73 0 0 1-.96 2.12ZM313 54.81a2.66 2.66 0 0 0-2 .85 5.43 5.43 0 0 0-1.22 2.11 7.91 7.91 0 0 0-.4 2.46 3.81 3.81 0 0 0 .42 2 1.31 1.31 0 0 0 1.17.71 2.42 2.42 0 0 0 1.37-.44 3.83 3.83 0 0 0 1-1l.93-6.28a2.13 2.13 0 0 0-1.27-.41ZM320.16 62.51a.56.56 0 0 0 .08.32.24.24 0 0 0 .2.12.8.8 0 0 0 .4-.12 4.16 4.16 0 0 0 .5-.41l.23.42a3.57 3.57 0 0 1-.78.78 2 2 0 0 1-1.24.4 1.32 1.32 0 0 1-.89-.27.92.92 0 0 1-.25-.82c0-.29.18-1.43.46-3.4.16-1.07.36-2.48.59-4.23l-1.09-.4.11-.6 2.49-.4.39.19-1.18 8.25Zm-.08-10.81a.93.93 0 0 1-.27-.68 1.25 1.25 0 0 1 .35-.89 1 1 0 0 1 .81-.37.93.93 0 0 1 .7.27.9.9 0 0 1 .27.66 1.36 1.36 0 0 1-.34.92 1.11 1.11 0 0 1-.88.37.87.87 0 0 1-.64-.28ZM328.56 54.52a3.54 3.54 0 0 1 2-.64 1.89 1.89 0 0 1 1.51.6 2.89 2.89 0 0 1 .53 1.94 16.85 16.85 0 0 1-.39 2.69l-.07.4-.14.84a12.68 12.68 0 0 0-.28 2.13c0 .31.08.47.23.47a1.41 1.41 0 0 0 .82-.44l.23.49a1.76 1.76 0 0 1-.37.4 3.17 3.17 0 0 1-.69.45 2 2 0 0 1-.9.2 1 1 0 0 1-1.16-1.05 14.6 14.6 0 0 1 .32-2.14l.16-.84.07-.42c.11-.64.21-1.19.28-1.66a9.18 9.18 0 0 0 .1-1.33 2 2 0 0 0-.23-1.11 1 1 0 0 0-.84-.31 2.59 2.59 0 0 0-1.57.7 6.6 6.6 0 0 0-1.48 1.67l-.86 6.33h-1.67l1.13-8.49-.86-.42.14-.66 2.14-.39.37.19-.23 2.11a6.56 6.56 0 0 1 1.71-1.71ZM340.41 63.44a4.26 4.26 0 0 1-2.23.6 3.35 3.35 0 0 1-1.95-.54 3 3 0 0 1-1.15-1.4 4.66 4.66 0 0 1-.37-1.87 7.38 7.38 0 0 1 .67-3.14 5.91 5.91 0 0 1 1.86-2.33 4.29 4.29 0 0 1 2.62-.88 2.62 2.62 0 0 1 1.88.6 2 2 0 0 1 .63 1.56 2.63 2.63 0 0 1-1 2.1 6.47 6.47 0 0 1-2.37 1.28 9.38 9.38 0 0 1-2.46.46A4 4 0 0 0 337 62a1.69 1.69 0 0 0 1.6.9 3.61 3.61 0 0 0 1.54-.36 4.27 4.27 0 0 0 1.39-1l.39.65a4.68 4.68 0 0 1-1.51 1.25Zm-2.4-8a4.53 4.53 0 0 0-1 1.65 6.69 6.69 0 0 0-.44 1.94 6.13 6.13 0 0 0 1.85-.39 4.25 4.25 0 0 0 1.6-1 2 2 0 0 0 .65-1.46 1.55 1.55 0 0 0-.32-1.05 1.14 1.14 0 0 0-.89-.36 2 2 0 0 0-1.46.68ZM349.39 63.44a4.26 4.26 0 0 1-2.23.6 3.35 3.35 0 0 1-2-.54 3.09 3.09 0 0 1-1.15-1.4 4.66 4.66 0 0 1-.37-1.87 7.38 7.38 0 0 1 .68-3.14 5.91 5.91 0 0 1 1.86-2.33 4.25 4.25 0 0 1 2.62-.88 2.65 2.65 0 0 1 1.88.6 2 2 0 0 1 .63 1.56 2.66 2.66 0 0 1-1 2.1 6.51 6.51 0 0 1-2.31 1.28 9.38 9.38 0 0 1-2.46.46 3.94 3.94 0 0 0 .43 2.13 1.66 1.66 0 0 0 1.59.9 3.65 3.65 0 0 0 1.55-.36 4.34 4.34 0 0 0 1.38-1l.39.65a4.68 4.68 0 0 1-1.49 1.24Zm-2.4-8a4.67 4.67 0 0 0-1 1.65 7 7 0 0 0-.44 1.94 6.07 6.07 0 0 0 1.85-.39 4.38 4.38 0 0 0 1.61-1 2 2 0 0 0 .65-1.46 1.5 1.5 0 0 0-.33-1.05 1.14 1.14 0 0 0-.89-.36 2 2 0 0 0-1.44.68ZM356.34 55.24a4.21 4.21 0 0 1 1.13-1 2.81 2.81 0 0 1 1.4-.38.93.93 0 0 1 .56.12l-.37 1.86a1.64 1.64 0 0 0-.86-.18 2.68 2.68 0 0 0-1.48.5 3.31 3.31 0 0 0-1.14 1.4l-.8 6.24h-1.69l1.11-8.45-.88-.44.12-.65 2.07-.4.35.21-.12 1.56-.08.7a3.9 3.9 0 0 1 .68-1.09ZM362.32 62.51a.56.56 0 0 0 .08.32.23.23 0 0 0 .2.12.8.8 0 0 0 .4-.12 4.16 4.16 0 0 0 .5-.41l.22.42a3.18 3.18 0 0 1-.78.78 2 2 0 0 1-1.23.4 1.3 1.3 0 0 1-.89-.27.92.92 0 0 1-.25-.82c0-.29.17-1.43.45-3.4.17-1.07.36-2.48.6-4.23l-1.09-.4.11-.6 2.49-.4.38.19-1.17 8.25Zm-.08-10.81a.93.93 0 0 1-.24-.7 1.24 1.24 0 0 1 .34-.89 1.07 1.07 0 0 1 .82-.37.94.94 0 0 1 .7.27.93.93 0 0 1 .26.66 1.35 1.35 0 0 1-.33.92 1.12 1.12 0 0 1-.88.37.86.86 0 0 1-.67-.26ZM370.36 54.52a3.55 3.55 0 0 1 2-.64 1.91 1.91 0 0 1 1.51.6 2.89 2.89 0 0 1 .52 1.94 17.7 17.7 0 0 1-.38 2.69l-.07.4-.14.84a12.68 12.68 0 0 0-.28 2.13c0 .31.07.47.22.47a1.4 1.4 0 0 0 .83-.44l.21.46a1.76 1.76 0 0 1-.37.4 3.74 3.74 0 0 1-.69.45 2.13 2.13 0 0 1-.91.2 1 1 0 0 1-1.1-1.07 14.1 14.1 0 0 1 .31-2.14l.16-.84.07-.42c.12-.64.21-1.19.28-1.66a9.27 9.27 0 0 0 .11-1.33 1.88 1.88 0 0 0-.24-1.11 1 1 0 0 0-.83-.31 2.59 2.59 0 0 0-1.57.7 6.6 6.6 0 0 0-1.48 1.67l-.86 6.33H366l1.12-8.49-.86-.42.14-.66 2.14-.39.37.19-.23 2.11a6.72 6.72 0 0 1 1.68-1.66ZM382.46 66.64a4.23 4.23 0 0 1-1.77 1.2 5.87 5.87 0 0 1-2 .37 7.34 7.34 0 0 1-1.12-.09 4.82 4.82 0 0 1-.88-.22l.37-1.42a6.58 6.58 0 0 0 1 .39 4.24 4.24 0 0 0 1.22.18 2.57 2.57 0 0 0 1.65-.43 2.53 2.53 0 0 0 .72-1.62l.33-2.33a4.25 4.25 0 0 1-1.18 1 3.07 3.07 0 0 1-1.52.39 2.52 2.52 0 0 1-2.17-1 4.5 4.5 0 0 1-.73-2.68 7.35 7.35 0 0 1 .67-3 6.27 6.27 0 0 1 1.95-2.51 4.71 4.71 0 0 1 3-1 5.1 5.1 0 0 1 1 .11 5.47 5.47 0 0 1 .91.28l1.09-.39-1.58 10.63a3.86 3.86 0 0 1-.96 2.14Zm-.7-11.83a2.62 2.62 0 0 0-2 .85 5.31 5.31 0 0 0-1.22 2.11 7.93 7.93 0 0 0-.41 2.46 3.7 3.7 0 0 0 .43 2 1.31 1.31 0 0 0 1.17.71 2.42 2.42 0 0 0 1.37-.44 3.79 3.79 0 0 0 1-1l.93-6.28a2.08 2.08 0 0 0-1.27-.41ZM295.85 80.3q1.44-3.12 1.89-4.29h3.76l-.07.75-1.56.19-.34 11.2 1.49.21-.02.64h-4.82l.07-.68 1.6-.21.4-7.76.23-3.56L297.1 80l-4.1 9.08-.94.12-1.44-9-.55-3.33-.71 3.4-1.88 7.9 1.77.21-.07.68h-4.53l.07-.68 1.46-.21L289 77l-1.62-.19.11-.75h4.07l1.35 8.56.23 1.79.77-1.76q.49-1.22 1.94-4.35ZM308 88.64a4.35 4.35 0 0 1-2.23.59 3.38 3.38 0 0 1-2-.53 3.26 3.26 0 0 1-1.15-1.4 4.87 4.87 0 0 1-.36-1.87 7.34 7.34 0 0 1 .67-3.14 6 6 0 0 1 1.91-2.29 4.32 4.32 0 0 1 2.62-.87 2.63 2.63 0 0 1 1.88.59 2.06 2.06 0 0 1 .63 1.56 2.65 2.65 0 0 1-1 2.11 6.62 6.62 0 0 1-2.37 1.28 10 10 0 0 1-2.46.46 3.89 3.89 0 0 0 .42 2.13 1.69 1.69 0 0 0 1.6.9 3.61 3.61 0 0 0 1.54-.36 4.3 4.3 0 0 0 1.39-1l.38.65a4.52 4.52 0 0 1-1.47 1.19Zm-2.41-8a4.68 4.68 0 0 0-1 1.64 7.5 7.5 0 0 0-.44 1.94 6.11 6.11 0 0 0 1.86-.38 4.61 4.61 0 0 0 1.6-1 2 2 0 0 0 .65-1.47 1.54 1.54 0 0 0-.32-1 1.15 1.15 0 0 0-.89-.36 2 2 0 0 0-1.45.64ZM318.78 87.71c0 .29.09.44.26.44a1.42 1.42 0 0 0 .81-.44l.24.44a3.31 3.31 0 0 1-.76.71 1.9 1.9 0 0 1-1.15.36c-.69 0-1-.38-1-1.13v-.38a4.57 4.57 0 0 1-1.23 1.07 3.18 3.18 0 0 1-1.65.44 2.46 2.46 0 0 1-2.14-1 4.54 4.54 0 0 1-.72-2.68 7.24 7.24 0 0 1 .67-3 6.3 6.3 0 0 1 1.89-2.48 4.67 4.67 0 0 1 3-1 4.42 4.42 0 0 1 1.31.21l.48-3.16-1.16-.3.14-.61 2.47-.32.39.23-1.83 12.4a.59.59 0 0 0-.02.2Zm-2-7.7a2.62 2.62 0 0 0-2 .85 5.14 5.14 0 0 0-1.21 2.1 8 8 0 0 0-.4 2.47 3.83 3.83 0 0 0 .42 2 1.27 1.27 0 0 0 1.16.7 2.39 2.39 0 0 0 1.4-.46 3.7 3.7 0 0 0 1-1l.95-6.19a2.2 2.2 0 0 0-1.32-.48ZM324.44 87.71a.56.56 0 0 0 .08.32.25.25 0 0 0 .21.12.79.79 0 0 0 .39-.13 3.18 3.18 0 0 0 .5-.4l.23.42a3.35 3.35 0 0 1-.78.77 2 2 0 0 1-1.24.41 1.34 1.34 0 0 1-.89-.28.92.92 0 0 1-.25-.81c0-.29.18-1.43.46-3.41.16-1.06.36-2.47.59-4.22l-1.08-.41.1-.59 2.49-.41.39.2-1.18 8.24Zm-.07-10.81a1 1 0 0 1-.28-.68 1.29 1.29 0 0 1 .35-.9 1.1 1.1 0 0 1 .81-.37.92.92 0 0 1 1 .93 1.29 1.29 0 0 1-.34.92 1.11 1.11 0 0 1-.87.38.84.84 0 0 1-.67-.28ZM332.76 80.18a2.22 2.22 0 0 0-1.53.62 4.15 4.15 0 0 0-1.06 1.74 8 8 0 0 0-.37 2.55 4.09 4.09 0 0 0 .49 2.24 1.59 1.59 0 0 0 1.42.75 2.71 2.71 0 0 0 1.29-.28 5.56 5.56 0 0 0 1.15-.81l.35.65a4.84 4.84 0 0 1-1.3 1.08 3.94 3.94 0 0 1-2 .5 2.78 2.78 0 0 1-2.31-1 4.49 4.49 0 0 1-.83-2.9 7.35 7.35 0 0 1 .6-2.87 6.1 6.1 0 0 1 1.72-2.45 4.26 4.26 0 0 1 2.77-.94 5.66 5.66 0 0 1 1.06.1 3.31 3.31 0 0 1 .92.3l-.47 1.7-.3-.1a2.88 2.88 0 0 0-1.6-.88ZM338.88 87.71a.56.56 0 0 0 .12.29.23.23 0 0 0 .2.12.82.82 0 0 0 .4-.13 3.18 3.18 0 0 0 .5-.4l.23.42a3.56 3.56 0 0 1-.78.77 2 2 0 0 1-1.24.41 1.32 1.32 0 0 1-.89-.28.9.9 0 0 1-.25-.81c0-.29.18-1.43.46-3.41.16-1.06.36-2.47.59-4.22l-1.09-.41.11-.59 2.49-.41.39.2-1.18 8.24Zm-.08-10.81a1 1 0 0 1-.27-.68 1.29 1.29 0 0 1 .35-.9 1.07 1.07 0 0 1 .81-.37.92.92 0 0 1 1 .93 1.34 1.34 0 0 1-.34.92 1.11 1.11 0 0 1-.88.38.87.87 0 0 1-.67-.28ZM347.19 79.72a3.54 3.54 0 0 1 2-.64 1.89 1.89 0 0 1 1.51.59 2.93 2.93 0 0 1 .53 2 16.77 16.77 0 0 1-.39 2.68l-.07.41-.14.84a12.6 12.6 0 0 0-.28 2.12c0 .32.08.48.23.48a1.38 1.38 0 0 0 .82-.44l.21.45a1.91 1.91 0 0 1-.36.41 3.11 3.11 0 0 1-.7.44 1.93 1.93 0 0 1-.9.21 1 1 0 0 1-1.11-1.07 14.24 14.24 0 0 1 .32-2.14l.16-.85.07-.42c.11-.63.21-1.18.28-1.66a9 9 0 0 0 .1-1.32 1.87 1.87 0 0 0-.23-1.11 1 1 0 0 0-.84-.31 2.66 2.66 0 0 0-1.57.69 6.48 6.48 0 0 0-1.48 1.68l-.89 6.24h-1.66l1.12-8.49-.86-.42.14-.67 2.14-.38.37.19-.23 2.1a6.52 6.52 0 0 1 1.71-1.61ZM359 88.64a4.35 4.35 0 0 1-2.23.59 3.34 3.34 0 0 1-1.95-.53 3.19 3.19 0 0 1-1.15-1.4 4.69 4.69 0 0 1-.37-1.87 7.34 7.34 0 0 1 .67-3.14 6 6 0 0 1 1.9-2.29 4.35 4.35 0 0 1 2.63-.87 2.61 2.61 0 0 1 1.87.59 2 2 0 0 1 .64 1.56 2.68 2.68 0 0 1-1 2.11 6.75 6.75 0 0 1-2.38 1.28 9.81 9.81 0 0 1-2.46.46 4.08 4.08 0 0 0 .42 2.13 1.69 1.69 0 0 0 1.6.9 3.65 3.65 0 0 0 1.55-.36 4.37 4.37 0 0 0 1.38-1l.39.65a4.57 4.57 0 0 1-1.51 1.19Zm-2.4-8a4.54 4.54 0 0 0-1 1.64 6.76 6.76 0 0 0-.44 1.94 6 6 0 0 0 1.85-.38 4.52 4.52 0 0 0 1.6-1 2 2 0 0 0 .65-1.47 1.49 1.49 0 0 0-.32-1 1.14 1.14 0 0 0-.89-.36 2 2 0 0 0-1.41.64Z" class="cls-2" transform="translate(-24.97 -24.05)"/> </svg> </a></div> <div class="global-nav__controls"><button class="controls__search" style="display: none;"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 30 30" class=""><path d="M13.8 21.6a7.8 7.8 0 110-15.6 7.8 7.8 0 010 15.6zm0-2a5.8 5.8 0 100-11.6 5.8 5.8 0 000 11.6z"></path><path d="M17.899 19.325l1.414-1.414 4.322 4.322-1.414 1.414z"></path></svg></button> <button class="controls__close" onclick="toggleSearch()"><span class="menus__close-label"> Close </span> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 30 30" class=""><path fill-rule="evenodd" d="M20.728 8l1.818 1.818-5.455 5.455 5.455 5.455-1.818 1.818-5.455-5.455-5.455 5.455L8 20.728l5.455-5.455L8 9.818 9.818 8l5.455 5.455z"></path></svg></button></div></div> <div class="mega-menu__content"> <div class="search-form sf-top" > <div class="search-form__container"> <label for="inputsearch"> Search for Publications Only </label> <form id="searchFormNAP" action="/search" enctype="application/x-www-form-urlencoded"> <input id="inputsearch" name="term" type="text" placeholder="Type a title, topic, ISBN, or DOI and hit enter"> <input type="hidden" name="v:project" value="uweb_proj_ext"> <button class="search-form__submit"> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 30 30" class=""> <path d="M13.8 21.6a7.8 7.8 0 110-15.6 7.8 7.8 0 010 15.6zm0-2a5.8 5.8 0 100-11.6 5.8 5.8 0 000 11.6z"></path> <path d="M17.899 19.325l1.414-1.414 4.322 4.322-1.414 1.414z"></path> </svg> </button> </form> </div> <!----></div> <div class="search-form"> <div class="search-form__container"> <label for="globalSearch"> Search All</label> <form id="searchForm" action="https://sparck.nationalacademies.org/vivisimo/cgi-bin/query-meta" enctype="application/x-www-form-urlencoded"> <input id="globalSearch" name="query" type="text" placeholder="Type anything and hit enter"> <input type="hidden" name="v:project" value="uweb_proj_ext"> <button class="search-form__submit"> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 30 30" class=""> <path d="M13.8 21.6a7.8 7.8 0 110-15.6 7.8 7.8 0 010 15.6zm0-2a5.8 5.8 0 100-11.6 5.8 5.8 0 000 11.6z"></path> <path d="M17.899 19.325l1.414-1.414 4.322 4.322-1.414 1.414z"></path> </svg> </button> </form> </div> <!----></div> <!----></div> </div> <div tabindex="0" aria-hidden="true"></div> </div> <!--Mega menu end --> <!--Mobile menu start --> <div aria-hidden="true" class="mega-menu" id="mobile-menu" style="display: none;"> <div data-lock=""> <div class="mega-menu__header"> <div class="global-nav__logo" style="padding-left: 10px;"> <a class="navbar-brand js-scroll-trigger" href="https://www.nationalacademies.org/"> <svg xmlns="http://www.w3.org/2000/svg" id="nasemLogo" data-name="nasemLogo" viewBox="0 0 360 66.64"> <defs/> <path d="m4.26 8.63 19.56 20.49V1.72h-3.47v18.93L.8.16v27.32h3.46V8.63zM32.55 27.48h3.83l8.15-19.2 7.93 18.99.09.21h3.82L44.62 0 32.55 27.48zM175.05 27.48h3.83l8.16-19.2 7.93 18.99.08.21h3.83L187.12 0l-12.07 27.48zM68.23 27.48h3.47V5.03h7.72V1.72H60.51v3.31h7.72v22.45zM90.08 1.72h3.46v25.76h-3.46z" class="cls-2"/> <path d="M157.14 38.67A13.39 13.39 0 1 0 143.75 52a13.21 13.21 0 0 0 13.39-13.33Zm-3.54 0a9.85 9.85 0 1 1-9.85-10 9.93 9.93 0 0 1 9.85 10Z" class="cls-2" transform="translate(-24.97 -24.05)"/> <path d="m146.56 8.63 19.56 20.49V1.72h-3.47v18.93L143.1.16v27.32h3.46V8.63zM210.95 1.72h-3.46v25.76h13.8v-3.31h-10.34V1.72z" class="cls-2"/> <path d="M67.41 63A13.13 13.13 0 0 0 54 76.37a13 13 0 0 0 13.26 13.24A13.48 13.48 0 0 0 75 87.1l.14-.1v-4.46l-.58.58a10.91 10.91 0 0 1-2.81 2 10 10 0 0 1-4.51 1.13c-6.74 0-9.77-5.78-9.77-9.89a9.82 9.82 0 0 1 9.74-10.11 10.44 10.44 0 0 1 4.18.94 12 12 0 0 1 3.17 2.27l.58.58v-4.41l-.13-.1a12.1 12.1 0 0 0-7.6-2.53ZM130 66.4a14 14 0 0 0-9.47-3h-5.45v25.75h5.42c4.25 0 6.88-.83 9.39-3a12.32 12.32 0 0 0 4.52-9.89A12.54 12.54 0 0 0 130 66.4Zm-2.39 17.26a10.37 10.37 0 0 1-7 2.18h-2.11V66.7h2.11c6.21 0 10.22 3.77 10.22 9.59a9.23 9.23 0 0 1-3.25 7.37Z" class="cls-2" transform="translate(-24.97 -24.05)"/> <path d="M119.94 65.11h15.33V61.8h-11.86v-9.07h10.38v-3.31h-10.38v-6.76h11.86v-3.32h-15.33v25.77zM201.26 65.11h15.33V61.8h-11.86v-9.07h10.37v-3.31h-10.37v-6.76h11.86v-3.32h-15.33v25.77zM158.66 58.65l-9.79-21.53-4.42 27.99h3.56l2.36-16.59 8.25 18.12 8.35-18.12 2.25 16.59h3.56l-4.14-28.03-9.98 21.57zM184.29 39.34h3.46V65.1h-3.46z" class="cls-2"/> <path d="M263.7 76.76a12.7 12.7 0 0 0-4-2.44l-2.42-1a8 8 0 0 1-2.53-1.51 2.32 2.32 0 0 1-.83-1.94c0-2.11 1.56-3.53 3.87-3.53a4.18 4.18 0 0 1 2.61.79 5.51 5.51 0 0 1 1.37 1.77l.17.34 2.8-1.85-.14-.27a7.79 7.79 0 0 0-2.56-2.91 7.16 7.16 0 0 0-4.18-1.21c-4.34 0-7.37 2.8-7.37 6.8a5.53 5.53 0 0 0 1.83 4.35 10.74 10.74 0 0 0 3.24 2l2.44 1.17a10.81 10.81 0 0 1 2.94 1.68 3.39 3.39 0 0 1 1.13 2.68A4.8 4.8 0 0 1 254 85a5.6 5.6 0 0 1-1.42-3l-.05-.39-3.4.94.07.32a9.51 9.51 0 0 0 2.43 4.61 7.73 7.73 0 0 0 5.69 2.13 7.9 7.9 0 0 0 8.28-8 6.38 6.38 0 0 0-1.9-4.85Z" class="cls-2" transform="translate(-24.97 -24.05)"/> <path d="M0 65.11h3.83l8.16-19.21 7.92 19 .09.21h3.83L12.07 37.63 0 65.11zM57.37 65.11h3.83l8.15-19.21 7.93 19 .08.21h3.83L69.44 37.63 57.37 65.11z" class="cls-2"/> <path d="M292 26.45a3.91 3.91 0 0 0-1.07-.14 2.94 2.94 0 0 0-1.74.52 1.71 1.71 0 0 0-.72 1.47 2.36 2.36 0 0 0 .63 1.7 9.45 9.45 0 0 0 1.9 1.38 15.52 15.52 0 0 1 1.45 1 4.28 4.28 0 0 1 .94 1.12 2.87 2.87 0 0 1 .38 1.51 3.57 3.57 0 0 1-.57 2 3.79 3.79 0 0 1-1.6 1.34 5.79 5.79 0 0 1-2.39.47 9.63 9.63 0 0 1-2.22-.25 4.15 4.15 0 0 1-1.41-.52l.39-2.49H287l.11 1.84a2.93 2.93 0 0 0 .92.39 5 5 0 0 0 1.16.14 3.39 3.39 0 0 0 2-.6 1.94 1.94 0 0 0 .83-1.68 2.25 2.25 0 0 0-.56-1.54 7.66 7.66 0 0 0-1.7-1.32c-.6-.39-1.1-.75-1.51-1.07a4.43 4.43 0 0 1-1-1.2 2.94 2.94 0 0 1-.43-1.59 3.08 3.08 0 0 1 .57-1.85 3.58 3.58 0 0 1 1.55-1.23 5.17 5.17 0 0 1 2.13-.43 7.84 7.84 0 0 1 2 .21 4 4 0 0 1 1.25.51l-.4 2.31h-.95l-.14-1.68a2.39 2.39 0 0 0-.83-.32ZM300.27 29.79a2.2 2.2 0 0 0-1.53.62 4.15 4.15 0 0 0-1.06 1.74 8 8 0 0 0-.38 2.55 4.11 4.11 0 0 0 .5 2.24 1.6 1.6 0 0 0 1.42.74 2.71 2.71 0 0 0 1.25-.27 5.56 5.56 0 0 0 1.15-.81l.35.64a4.42 4.42 0 0 1-1.31 1.08 3.78 3.78 0 0 1-2 .5 2.76 2.76 0 0 1-2.31-1 4.51 4.51 0 0 1-.83-2.9 7.35 7.35 0 0 1 .6-2.87 6 6 0 0 1 1.77-2.38 4.27 4.27 0 0 1 2.77-.95 5.7 5.7 0 0 1 1.06.11 3.31 3.31 0 0 1 .92.3l-.48 1.7-.29-.11a2.91 2.91 0 0 0-1.6-.93ZM306.13 37.31a.54.54 0 0 0 .08.33.22.22 0 0 0 .2.11.74.74 0 0 0 .39-.12 2.88 2.88 0 0 0 .5-.4l.23.42a3.34 3.34 0 0 1-.78.77 2 2 0 0 1-1.23.4 1.3 1.3 0 0 1-.89-.27.9.9 0 0 1-.26-.81c0-.3.18-1.43.46-3.41q.24-1.59.6-4.23l-1.09-.4.11-.6 2.49-.4.38.19-1.17 8.25Zm-.08-10.8a1 1 0 0 1-.27-.69 1.24 1.24 0 0 1 .34-.89 1.07 1.07 0 0 1 .82-.37.94.94 0 0 1 .7.27.93.93 0 0 1 .26.66 1.35 1.35 0 0 1-.33.92 1.14 1.14 0 0 1-.88.38.9.9 0 0 1-.64-.28ZM315.15 38.24a4.26 4.26 0 0 1-2.23.6 3.45 3.45 0 0 1-2-.53 3.23 3.23 0 0 1-1.15-1.41 4.83 4.83 0 0 1-.36-1.87 7.38 7.38 0 0 1 .67-3.14 5.91 5.91 0 0 1 1.92-2.33 4.33 4.33 0 0 1 2.62-.88 2.64 2.64 0 0 1 1.88.6 2.06 2.06 0 0 1 .63 1.56 2.66 2.66 0 0 1-1 2.11 6.62 6.62 0 0 1-2.37 1.28 9.48 9.48 0 0 1-2.46.45 3.85 3.85 0 0 0 .42 2.13 1.68 1.68 0 0 0 1.6.91 3.61 3.61 0 0 0 1.54-.36 4.41 4.41 0 0 0 1.39-1l.38.65a4.39 4.39 0 0 1-1.48 1.23Zm-2.41-8a4.82 4.82 0 0 0-1 1.65 7.41 7.41 0 0 0-.44 1.94 5.85 5.85 0 0 0 1.86-.39 4.34 4.34 0 0 0 1.6-1 2 2 0 0 0 .65-1.46 1.5 1.5 0 0 0-.33-1.05 1.14 1.14 0 0 0-.88-.35 2 2 0 0 0-1.46.67ZM323.42 29.32a3.62 3.62 0 0 1 2-.64 1.89 1.89 0 0 1 1.51.6 2.93 2.93 0 0 1 .53 1.95 16.77 16.77 0 0 1-.39 2.68l-.07.4-.14.85a12.6 12.6 0 0 0-.28 2.12c0 .32.08.47.23.47a1.35 1.35 0 0 0 .82-.44l.21.46a1.7 1.7 0 0 1-.36.4 2.81 2.81 0 0 1-.7.45 1.92 1.92 0 0 1-.9.2c-.74 0-1.11-.35-1.11-1.07a14.6 14.6 0 0 1 .32-2.14l.16-.84.07-.42c.11-.63.21-1.18.28-1.66a9 9 0 0 0 .1-1.32 2 2 0 0 0-.23-1.12 1 1 0 0 0-.84-.3 2.63 2.63 0 0 0-1.57.69 6.6 6.6 0 0 0-1.48 1.67l-.86 6.34H319l1.13-8.49-.86-.42.14-.67 2.14-.39.37.2-.23 2.1a6.56 6.56 0 0 1 1.73-1.66ZM334.3 29.79a2.22 2.22 0 0 0-1.53.62 4.14 4.14 0 0 0-1 1.74 7.68 7.68 0 0 0-.38 2.55 4.11 4.11 0 0 0 .49 2.24 1.61 1.61 0 0 0 1.42.74 2.78 2.78 0 0 0 1.26-.27 5.52 5.52 0 0 0 1.14-.81l.36.64a4.56 4.56 0 0 1-1.31 1.08 3.85 3.85 0 0 1-2 .5 2.79 2.79 0 0 1-2.31-1 4.57 4.57 0 0 1-.83-2.9 7.19 7.19 0 0 1 .61-2.87 5.94 5.94 0 0 1 1.77-2.38 4.24 4.24 0 0 1 2.76-.95 5.7 5.7 0 0 1 1.06.11 3.2 3.2 0 0 1 .92.3l-.47 1.7-.3-.11a2.91 2.91 0 0 0-1.66-.93ZM343.32 38.24a4.26 4.26 0 0 1-2.23.6 3.42 3.42 0 0 1-1.95-.53A3.17 3.17 0 0 1 338 36.9a4.66 4.66 0 0 1-.37-1.87 7.53 7.53 0 0 1 .67-3.14 6 6 0 0 1 1.86-2.33 4.36 4.36 0 0 1 2.63-.88 2.65 2.65 0 0 1 1.88.6 2.06 2.06 0 0 1 .63 1.56 2.69 2.69 0 0 1-1 2.11 6.66 6.66 0 0 1-2.38 1.28 9.33 9.33 0 0 1-2.46.45 4 4 0 0 0 .42 2.13 1.68 1.68 0 0 0 1.6.91 3.65 3.65 0 0 0 1.55-.36 4.37 4.37 0 0 0 1.38-1l.39.65a4.43 4.43 0 0 1-1.48 1.23Zm-2.4-8a4.67 4.67 0 0 0-1 1.65 7 7 0 0 0-.44 1.94 5.79 5.79 0 0 0 1.85-.39 4.25 4.25 0 0 0 1.6-1 2 2 0 0 0 .65-1.46 1.5 1.5 0 0 0-.32-1.05 1.17 1.17 0 0 0-.89-.35 1.93 1.93 0 0 0-1.45.67ZM351.91 29.91a3.08 3.08 0 0 0-1.24-.24 2.15 2.15 0 0 0-1.3.35 1.18 1.18 0 0 0-.49 1 1.54 1.54 0 0 0 .4 1.06 6.17 6.17 0 0 0 1.13 1c.42.33.76.61 1 .85a3.35 3.35 0 0 1 .67.87 2.38 2.38 0 0 1 .3 1.2 2.4 2.4 0 0 1-1 2.07 4.21 4.21 0 0 1-2.53.73 7.55 7.55 0 0 1-1.57-.17 2.73 2.73 0 0 1-1-.39l.29-1.21a3.77 3.77 0 0 0 1 .5 3.94 3.94 0 0 0 1.36.24 2.47 2.47 0 0 0 1.31-.33 1.14 1.14 0 0 0 .55-1.06 1.58 1.58 0 0 0-.43-1.09 8 8 0 0 0-1.26-1 3.53 3.53 0 0 1-1.81-2.86 2.43 2.43 0 0 1 .46-1.45 2.92 2.92 0 0 1 1.25-1 4.48 4.48 0 0 1 1.75-.34 7.2 7.2 0 0 1 1.29.12 4.56 4.56 0 0 1 .92.22l-.3 1.33a1.83 1.83 0 0 0-.75-.4ZM287 50.81h8.32l-.12 2.79h-1l-.28-1.84-4-.14-.67 5 4.07-.14-.12 1.32-4-.14-.81 5.34 4.95-.21 1-2.12 1 .19-.71 3h-9.33l.07-.68 1.32-.21 1.4-11.19-1.19-.2ZM301.65 54.52a3.52 3.52 0 0 1 2-.64 1.89 1.89 0 0 1 1.51.6 2.89 2.89 0 0 1 .53 1.94 16.85 16.85 0 0 1-.39 2.69l-.07.4-.14.84a12.68 12.68 0 0 0-.28 2.13c0 .31.07.47.23.47a1.41 1.41 0 0 0 .82-.44l.14.49a1.76 1.76 0 0 1-.37.4 3.17 3.17 0 0 1-.69.45 2 2 0 0 1-.9.2A1 1 0 0 1 303 63a14.6 14.6 0 0 1 .32-2.14l.16-.84.07-.42c.11-.64.21-1.19.28-1.66a9.18 9.18 0 0 0 .1-1.33 2 2 0 0 0-.23-1.11 1 1 0 0 0-.84-.31 2.59 2.59 0 0 0-1.57.7 6.6 6.6 0 0 0-1.48 1.67l-.86 6.33h-1.67l1.13-8.49-.86-.42.14-.66 2.14-.39.37.19-.23 2.11a6.56 6.56 0 0 1 1.68-1.71ZM313.74 66.64a4.23 4.23 0 0 1-1.77 1.2 5.86 5.86 0 0 1-2 .37 7.37 7.37 0 0 1-1.13-.09 4.89 4.89 0 0 1-.87-.22l.37-1.42a6.44 6.44 0 0 0 1 .39 4.29 4.29 0 0 0 1.22.18 2.62 2.62 0 0 0 1.66-.43 2.58 2.58 0 0 0 .71-1.62l.33-2.33a4.25 4.25 0 0 1-1.18 1 3 3 0 0 1-1.52.39 2.52 2.52 0 0 1-2.17-1 4.5 4.5 0 0 1-.72-2.68 7.33 7.33 0 0 1 .66-3 6.45 6.45 0 0 1 1.95-2.49 4.73 4.73 0 0 1 3-1 5.1 5.1 0 0 1 1 .11 5.19 5.19 0 0 1 .91.28l1.09-.39-1.58 10.63a3.73 3.73 0 0 1-.96 2.12ZM313 54.81a2.66 2.66 0 0 0-2 .85 5.43 5.43 0 0 0-1.22 2.11 7.91 7.91 0 0 0-.4 2.46 3.81 3.81 0 0 0 .42 2 1.31 1.31 0 0 0 1.17.71 2.42 2.42 0 0 0 1.37-.44 3.83 3.83 0 0 0 1-1l.93-6.28a2.13 2.13 0 0 0-1.27-.41ZM320.16 62.51a.56.56 0 0 0 .08.32.24.24 0 0 0 .2.12.8.8 0 0 0 .4-.12 4.16 4.16 0 0 0 .5-.41l.23.42a3.57 3.57 0 0 1-.78.78 2 2 0 0 1-1.24.4 1.32 1.32 0 0 1-.89-.27.92.92 0 0 1-.25-.82c0-.29.18-1.43.46-3.4.16-1.07.36-2.48.59-4.23l-1.09-.4.11-.6 2.49-.4.39.19-1.18 8.25Zm-.08-10.81a.93.93 0 0 1-.27-.68 1.25 1.25 0 0 1 .35-.89 1 1 0 0 1 .81-.37.93.93 0 0 1 .7.27.9.9 0 0 1 .27.66 1.36 1.36 0 0 1-.34.92 1.11 1.11 0 0 1-.88.37.87.87 0 0 1-.64-.28ZM328.56 54.52a3.54 3.54 0 0 1 2-.64 1.89 1.89 0 0 1 1.51.6 2.89 2.89 0 0 1 .53 1.94 16.85 16.85 0 0 1-.39 2.69l-.07.4-.14.84a12.68 12.68 0 0 0-.28 2.13c0 .31.08.47.23.47a1.41 1.41 0 0 0 .82-.44l.23.49a1.76 1.76 0 0 1-.37.4 3.17 3.17 0 0 1-.69.45 2 2 0 0 1-.9.2 1 1 0 0 1-1.16-1.05 14.6 14.6 0 0 1 .32-2.14l.16-.84.07-.42c.11-.64.21-1.19.28-1.66a9.18 9.18 0 0 0 .1-1.33 2 2 0 0 0-.23-1.11 1 1 0 0 0-.84-.31 2.59 2.59 0 0 0-1.57.7 6.6 6.6 0 0 0-1.48 1.67l-.86 6.33h-1.67l1.13-8.49-.86-.42.14-.66 2.14-.39.37.19-.23 2.11a6.56 6.56 0 0 1 1.71-1.71ZM340.41 63.44a4.26 4.26 0 0 1-2.23.6 3.35 3.35 0 0 1-1.95-.54 3 3 0 0 1-1.15-1.4 4.66 4.66 0 0 1-.37-1.87 7.38 7.38 0 0 1 .67-3.14 5.91 5.91 0 0 1 1.86-2.33 4.29 4.29 0 0 1 2.62-.88 2.62 2.62 0 0 1 1.88.6 2 2 0 0 1 .63 1.56 2.63 2.63 0 0 1-1 2.1 6.47 6.47 0 0 1-2.37 1.28 9.38 9.38 0 0 1-2.46.46A4 4 0 0 0 337 62a1.69 1.69 0 0 0 1.6.9 3.61 3.61 0 0 0 1.54-.36 4.27 4.27 0 0 0 1.39-1l.39.65a4.68 4.68 0 0 1-1.51 1.25Zm-2.4-8a4.53 4.53 0 0 0-1 1.65 6.69 6.69 0 0 0-.44 1.94 6.13 6.13 0 0 0 1.85-.39 4.25 4.25 0 0 0 1.6-1 2 2 0 0 0 .65-1.46 1.55 1.55 0 0 0-.32-1.05 1.14 1.14 0 0 0-.89-.36 2 2 0 0 0-1.46.68ZM349.39 63.44a4.26 4.26 0 0 1-2.23.6 3.35 3.35 0 0 1-2-.54 3.09 3.09 0 0 1-1.15-1.4 4.66 4.66 0 0 1-.37-1.87 7.38 7.38 0 0 1 .68-3.14 5.91 5.91 0 0 1 1.86-2.33 4.25 4.25 0 0 1 2.62-.88 2.65 2.65 0 0 1 1.88.6 2 2 0 0 1 .63 1.56 2.66 2.66 0 0 1-1 2.1 6.51 6.51 0 0 1-2.31 1.28 9.38 9.38 0 0 1-2.46.46 3.94 3.94 0 0 0 .43 2.13 1.66 1.66 0 0 0 1.59.9 3.65 3.65 0 0 0 1.55-.36 4.34 4.34 0 0 0 1.38-1l.39.65a4.68 4.68 0 0 1-1.49 1.24Zm-2.4-8a4.67 4.67 0 0 0-1 1.65 7 7 0 0 0-.44 1.94 6.07 6.07 0 0 0 1.85-.39 4.38 4.38 0 0 0 1.61-1 2 2 0 0 0 .65-1.46 1.5 1.5 0 0 0-.33-1.05 1.14 1.14 0 0 0-.89-.36 2 2 0 0 0-1.44.68ZM356.34 55.24a4.21 4.21 0 0 1 1.13-1 2.81 2.81 0 0 1 1.4-.38.93.93 0 0 1 .56.12l-.37 1.86a1.64 1.64 0 0 0-.86-.18 2.68 2.68 0 0 0-1.48.5 3.31 3.31 0 0 0-1.14 1.4l-.8 6.24h-1.69l1.11-8.45-.88-.44.12-.65 2.07-.4.35.21-.12 1.56-.08.7a3.9 3.9 0 0 1 .68-1.09ZM362.32 62.51a.56.56 0 0 0 .08.32.23.23 0 0 0 .2.12.8.8 0 0 0 .4-.12 4.16 4.16 0 0 0 .5-.41l.22.42a3.18 3.18 0 0 1-.78.78 2 2 0 0 1-1.23.4 1.3 1.3 0 0 1-.89-.27.92.92 0 0 1-.25-.82c0-.29.17-1.43.45-3.4.17-1.07.36-2.48.6-4.23l-1.09-.4.11-.6 2.49-.4.38.19-1.17 8.25Zm-.08-10.81a.93.93 0 0 1-.24-.7 1.24 1.24 0 0 1 .34-.89 1.07 1.07 0 0 1 .82-.37.94.94 0 0 1 .7.27.93.93 0 0 1 .26.66 1.35 1.35 0 0 1-.33.92 1.12 1.12 0 0 1-.88.37.86.86 0 0 1-.67-.26ZM370.36 54.52a3.55 3.55 0 0 1 2-.64 1.91 1.91 0 0 1 1.51.6 2.89 2.89 0 0 1 .52 1.94 17.7 17.7 0 0 1-.38 2.69l-.07.4-.14.84a12.68 12.68 0 0 0-.28 2.13c0 .31.07.47.22.47a1.4 1.4 0 0 0 .83-.44l.21.46a1.76 1.76 0 0 1-.37.4 3.74 3.74 0 0 1-.69.45 2.13 2.13 0 0 1-.91.2 1 1 0 0 1-1.1-1.07 14.1 14.1 0 0 1 .31-2.14l.16-.84.07-.42c.12-.64.21-1.19.28-1.66a9.27 9.27 0 0 0 .11-1.33 1.88 1.88 0 0 0-.24-1.11 1 1 0 0 0-.83-.31 2.59 2.59 0 0 0-1.57.7 6.6 6.6 0 0 0-1.48 1.67l-.86 6.33H366l1.12-8.49-.86-.42.14-.66 2.14-.39.37.19-.23 2.11a6.72 6.72 0 0 1 1.68-1.66ZM382.46 66.64a4.23 4.23 0 0 1-1.77 1.2 5.87 5.87 0 0 1-2 .37 7.34 7.34 0 0 1-1.12-.09 4.82 4.82 0 0 1-.88-.22l.37-1.42a6.58 6.58 0 0 0 1 .39 4.24 4.24 0 0 0 1.22.18 2.57 2.57 0 0 0 1.65-.43 2.53 2.53 0 0 0 .72-1.62l.33-2.33a4.25 4.25 0 0 1-1.18 1 3.07 3.07 0 0 1-1.52.39 2.52 2.52 0 0 1-2.17-1 4.5 4.5 0 0 1-.73-2.68 7.35 7.35 0 0 1 .67-3 6.27 6.27 0 0 1 1.95-2.51 4.71 4.71 0 0 1 3-1 5.1 5.1 0 0 1 1 .11 5.47 5.47 0 0 1 .91.28l1.09-.39-1.58 10.63a3.86 3.86 0 0 1-.96 2.14Zm-.7-11.83a2.62 2.62 0 0 0-2 .85 5.31 5.31 0 0 0-1.22 2.11 7.93 7.93 0 0 0-.41 2.46 3.7 3.7 0 0 0 .43 2 1.31 1.31 0 0 0 1.17.71 2.42 2.42 0 0 0 1.37-.44 3.79 3.79 0 0 0 1-1l.93-6.28a2.08 2.08 0 0 0-1.27-.41ZM295.85 80.3q1.44-3.12 1.89-4.29h3.76l-.07.75-1.56.19-.34 11.2 1.49.21-.02.64h-4.82l.07-.68 1.6-.21.4-7.76.23-3.56L297.1 80l-4.1 9.08-.94.12-1.44-9-.55-3.33-.71 3.4-1.88 7.9 1.77.21-.07.68h-4.53l.07-.68 1.46-.21L289 77l-1.62-.19.11-.75h4.07l1.35 8.56.23 1.79.77-1.76q.49-1.22 1.94-4.35ZM308 88.64a4.35 4.35 0 0 1-2.23.59 3.38 3.38 0 0 1-2-.53 3.26 3.26 0 0 1-1.15-1.4 4.87 4.87 0 0 1-.36-1.87 7.34 7.34 0 0 1 .67-3.14 6 6 0 0 1 1.91-2.29 4.32 4.32 0 0 1 2.62-.87 2.63 2.63 0 0 1 1.88.59 2.06 2.06 0 0 1 .63 1.56 2.65 2.65 0 0 1-1 2.11 6.62 6.62 0 0 1-2.37 1.28 10 10 0 0 1-2.46.46 3.89 3.89 0 0 0 .42 2.13 1.69 1.69 0 0 0 1.6.9 3.61 3.61 0 0 0 1.54-.36 4.3 4.3 0 0 0 1.39-1l.38.65a4.52 4.52 0 0 1-1.47 1.19Zm-2.41-8a4.68 4.68 0 0 0-1 1.64 7.5 7.5 0 0 0-.44 1.94 6.11 6.11 0 0 0 1.86-.38 4.61 4.61 0 0 0 1.6-1 2 2 0 0 0 .65-1.47 1.54 1.54 0 0 0-.32-1 1.15 1.15 0 0 0-.89-.36 2 2 0 0 0-1.45.64ZM318.78 87.71c0 .29.09.44.26.44a1.42 1.42 0 0 0 .81-.44l.24.44a3.31 3.31 0 0 1-.76.71 1.9 1.9 0 0 1-1.15.36c-.69 0-1-.38-1-1.13v-.38a4.57 4.57 0 0 1-1.23 1.07 3.18 3.18 0 0 1-1.65.44 2.46 2.46 0 0 1-2.14-1 4.54 4.54 0 0 1-.72-2.68 7.24 7.24 0 0 1 .67-3 6.3 6.3 0 0 1 1.89-2.48 4.67 4.67 0 0 1 3-1 4.42 4.42 0 0 1 1.31.21l.48-3.16-1.16-.3.14-.61 2.47-.32.39.23-1.83 12.4a.59.59 0 0 0-.02.2Zm-2-7.7a2.62 2.62 0 0 0-2 .85 5.14 5.14 0 0 0-1.21 2.1 8 8 0 0 0-.4 2.47 3.83 3.83 0 0 0 .42 2 1.27 1.27 0 0 0 1.16.7 2.39 2.39 0 0 0 1.4-.46 3.7 3.7 0 0 0 1-1l.95-6.19a2.2 2.2 0 0 0-1.32-.48ZM324.44 87.71a.56.56 0 0 0 .08.32.25.25 0 0 0 .21.12.79.79 0 0 0 .39-.13 3.18 3.18 0 0 0 .5-.4l.23.42a3.35 3.35 0 0 1-.78.77 2 2 0 0 1-1.24.41 1.34 1.34 0 0 1-.89-.28.92.92 0 0 1-.25-.81c0-.29.18-1.43.46-3.41.16-1.06.36-2.47.59-4.22l-1.08-.41.1-.59 2.49-.41.39.2-1.18 8.24Zm-.07-10.81a1 1 0 0 1-.28-.68 1.29 1.29 0 0 1 .35-.9 1.1 1.1 0 0 1 .81-.37.92.92 0 0 1 1 .93 1.29 1.29 0 0 1-.34.92 1.11 1.11 0 0 1-.87.38.84.84 0 0 1-.67-.28ZM332.76 80.18a2.22 2.22 0 0 0-1.53.62 4.15 4.15 0 0 0-1.06 1.74 8 8 0 0 0-.37 2.55 4.09 4.09 0 0 0 .49 2.24 1.59 1.59 0 0 0 1.42.75 2.71 2.71 0 0 0 1.29-.28 5.56 5.56 0 0 0 1.15-.81l.35.65a4.84 4.84 0 0 1-1.3 1.08 3.94 3.94 0 0 1-2 .5 2.78 2.78 0 0 1-2.31-1 4.49 4.49 0 0 1-.83-2.9 7.35 7.35 0 0 1 .6-2.87 6.1 6.1 0 0 1 1.72-2.45 4.26 4.26 0 0 1 2.77-.94 5.66 5.66 0 0 1 1.06.1 3.31 3.31 0 0 1 .92.3l-.47 1.7-.3-.1a2.88 2.88 0 0 0-1.6-.88ZM338.88 87.71a.56.56 0 0 0 .12.29.23.23 0 0 0 .2.12.82.82 0 0 0 .4-.13 3.18 3.18 0 0 0 .5-.4l.23.42a3.56 3.56 0 0 1-.78.77 2 2 0 0 1-1.24.41 1.32 1.32 0 0 1-.89-.28.9.9 0 0 1-.25-.81c0-.29.18-1.43.46-3.41.16-1.06.36-2.47.59-4.22l-1.09-.41.11-.59 2.49-.41.39.2-1.18 8.24Zm-.08-10.81a1 1 0 0 1-.27-.68 1.29 1.29 0 0 1 .35-.9 1.07 1.07 0 0 1 .81-.37.92.92 0 0 1 1 .93 1.34 1.34 0 0 1-.34.92 1.11 1.11 0 0 1-.88.38.87.87 0 0 1-.67-.28ZM347.19 79.72a3.54 3.54 0 0 1 2-.64 1.89 1.89 0 0 1 1.51.59 2.93 2.93 0 0 1 .53 2 16.77 16.77 0 0 1-.39 2.68l-.07.41-.14.84a12.6 12.6 0 0 0-.28 2.12c0 .32.08.48.23.48a1.38 1.38 0 0 0 .82-.44l.21.45a1.91 1.91 0 0 1-.36.41 3.11 3.11 0 0 1-.7.44 1.93 1.93 0 0 1-.9.21 1 1 0 0 1-1.11-1.07 14.24 14.24 0 0 1 .32-2.14l.16-.85.07-.42c.11-.63.21-1.18.28-1.66a9 9 0 0 0 .1-1.32 1.87 1.87 0 0 0-.23-1.11 1 1 0 0 0-.84-.31 2.66 2.66 0 0 0-1.57.69 6.48 6.48 0 0 0-1.48 1.68l-.89 6.24h-1.66l1.12-8.49-.86-.42.14-.67 2.14-.38.37.19-.23 2.1a6.52 6.52 0 0 1 1.71-1.61ZM359 88.64a4.35 4.35 0 0 1-2.23.59 3.34 3.34 0 0 1-1.95-.53 3.19 3.19 0 0 1-1.15-1.4 4.69 4.69 0 0 1-.37-1.87 7.34 7.34 0 0 1 .67-3.14 6 6 0 0 1 1.9-2.29 4.35 4.35 0 0 1 2.63-.87 2.61 2.61 0 0 1 1.87.59 2 2 0 0 1 .64 1.56 2.68 2.68 0 0 1-1 2.11 6.75 6.75 0 0 1-2.38 1.28 9.81 9.81 0 0 1-2.46.46 4.08 4.08 0 0 0 .42 2.13 1.69 1.69 0 0 0 1.6.9 3.65 3.65 0 0 0 1.55-.36 4.37 4.37 0 0 0 1.38-1l.39.65a4.57 4.57 0 0 1-1.51 1.19Zm-2.4-8a4.54 4.54 0 0 0-1 1.64 6.76 6.76 0 0 0-.44 1.94 6 6 0 0 0 1.85-.38 4.52 4.52 0 0 0 1.6-1 2 2 0 0 0 .65-1.47 1.49 1.49 0 0 0-.32-1 1.14 1.14 0 0 0-.89-.36 2 2 0 0 0-1.41.64Z" class="cls-2" transform="translate(-24.97 -24.05)"/> </svg> </a> </div> <div class="global-nav__controls"><button class="controls__menu"> Close <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 30 30" class=""><path fill-rule="evenodd" d="M20.728 8l1.818 1.818-5.455 5.455 5.455 5.455-1.818 1.818-5.455-5.455-5.455 5.455L8 20.728l5.455-5.455L8 9.818 9.818 8l5.455 5.455z"></path></svg> </button> </div></div> <div class="mega-menu__content"><div> <button class="accordion">About Us</button> <div class="panel"><ul><li><a href="https://www.nationalacademies.org/about"> About Us </a></li><li><a href="https://www.nationalacademies.org/about/organization"> Our Program Divisions </a></li><li><a href="https://www.nationalacademies.org/about/the-national-academies"> Our Three Academies </a></li><li><a href="https://www.nationalacademies.org/about/leadership"> Leadership </a></li><li><a href="https://www.nationalacademies.org/newsroom"> Newsroom </a></li><li><a href="https://www.nationalacademies.org/ocga"> Government Affairs </a></li><li><a href="https://www.nationalacademies.org/giving"> Giving </a></li><li><a href="https://www.nationalacademies.org/about/institutional-policies-and-procedures/statement-on-diversity-and-inclusion"> Statement on Diversity and Inclusion </a></li></ul> </div> <button class="no-accordion"><a href="https://www.nationalacademies.org/events">Events</a></button> <button class="accordion">Our Work</button> <div class="panel"><ul><li><a href="https://www.nationalacademies.org/our-work"> Our Work </a></li><li><a href="https://www.nationalacademies.org/about/our-study-process"> Our Study Process </a></li><li><a href="https://www.nationalacademies.org/about/institutional-policies-and-procedures/conflict-of-interest-policies-and-procedures"> Conflict of Interest Policies and Procedures </a></li><li><a href="https://www.nationalacademies.org/about/institutional-policies-and-procedures/project-comments-and-information"> Project Comments and Information </a></li></ul> </div> <button class="accordion">Publications</button> <div class="panel"> <ul><li><a href="https://nap.nationalacademies.org/" target="_self"> Read Our Expert Reports and Published Proceedings </a></li><li><a href="https://www.pnas.org/" target="_self"> Explore PNAS, the Flagship Scientific Journal of NAS </a></li><li><a href="http://pubsindex.trb.org" target="_self"> Access Transportation Research Board Publications </a></li></ul> </div> <button class="accordion">Topics</button> <div class="panel"> <ul><li><a href="https://www.nationalacademies.org/topics/covid-19-resources"> Coronavirus Disease 2019 (COVID-19) </a></li><li><a href="https://www.nationalacademies.org/topics/resources-on-diversity-equity-and-inclusion"> Diversity, Equity, and Inclusion </a></li><li><a href="https://www.nationalacademies.org/topics/climate"> Climate </a></li><li><a href="https://www.nationalacademies.org/topics/economic-recovery"> Economic Recovery </a></li></ul> </div> <button class="no-accordion"><a href="https://www.nationalacademies.org/engagement">Engagement</a></button> <button class="accordion">Opportunities</button> <div class="panel"> <ul><li><a href="https://www.nationalacademies.org/careers"> Careers </a></li><li><a href="https://www.nationalacademies.org/fellowships-and-grants"> Fellowships and Grants </a></li><li><a href="https://www.nationalacademies.org/about/volunteers"> Volunteers </a></li><li><a href="https://www.nationalacademies.org/about/sponsors"> Sponsors </a></li><li><a href="https://www.nationalacademies.org/about/members"> Members </a></li></ul> </div> </div></div> </div> </div> <!--Mobile menu end --> </div> <div class="container flex justify-between"> <div class="global-nav__logo" > <a class="navbar-brand js-scroll-trigger" aria-label="Logo of The National Academies" href="https://www.nationalacademies.org/home"> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 315.11 58.33"> <defs><style>.cls-2{fill:#211747;}</style></defs><g id="Layer_2" data-name="Layer 2"><g id="Layer_1-2" data-name="Layer 1"><polygon class="cls-2" points="3.73 7.55 20.84 25.49 20.84 1.5 17.81 1.5 17.81 18.08 0.7 0.14 0.7 24.06 3.73 24.06 3.73 7.55"/><polygon class="cls-2" points="28.49 24.06 31.84 24.06 38.98 7.25 45.92 23.87 45.99 24.06 49.34 24.06 39.05 0 28.49 24.06"/><polygon class="cls-2" points="153.23 24.06 156.58 24.06 163.72 7.25 170.66 23.87 170.73 24.06 174.08 24.06 163.79 0 153.23 24.06"/><polygon class="cls-2" points="59.72 24.06 62.76 24.06 62.76 4.41 69.52 4.41 69.52 1.5 52.96 1.5 52.96 4.41 59.72 4.41 59.72 24.06"/><rect class="cls-2" x="78.85" y="1.5" width="3.03" height="22.55"/><path class="cls-2" d="M115.69,12.8a11.72,11.72,0,0,0-23.44,0,11.72,11.72,0,0,0,23.44,0m-3.09,0A8.63,8.63,0,1,1,104,4a8.7,8.7,0,0,1,8.63,8.76"/><polygon class="cls-2" points="128.29 7.55 145.4 25.49 145.4 1.5 142.37 1.5 142.37 18.08 125.25 0.14 125.25 24.06 128.29 24.06 128.29 7.55"/><polygon class="cls-2" points="184.65 1.5 181.62 1.5 181.62 24.06 193.7 24.06 193.7 21.16 184.65 21.16 184.65 1.5"/><path class="cls-2" d="M37.15,34.08A11.48,11.48,0,0,0,25.37,45.8,11.36,11.36,0,0,0,37,57.38a11.77,11.77,0,0,0,6.79-2.19l.13-.09V51.2l-.51.51A9.77,9.77,0,0,1,41,53.5a8.9,8.9,0,0,1-3.95,1A8.75,8.75,0,0,1,37,37a9.09,9.09,0,0,1,3.66.82,10.71,10.71,0,0,1,2.78,2l.51.5V36.4l-.12-.09a10.62,10.62,0,0,0-6.67-2.23"/><path class="cls-2" d="M91.91,37.08a12.19,12.19,0,0,0-8.29-2.64H78.85V57h4.74c3.72,0,6-.73,8.22-2.61a10.75,10.75,0,0,0,4-8.65,11,11,0,0,0-3.86-8.65m-2.09,15.1a9.11,9.11,0,0,1-6.1,1.91H81.88V37.34h1.84c5.44,0,9,3.29,9,8.39a8.09,8.09,0,0,1-2.85,6.45"/><polygon class="cls-2" points="104.99 56.99 118.4 56.99 118.4 54.09 108.02 54.09 108.02 46.16 117.11 46.16 117.11 43.26 108.02 43.26 108.02 37.34 118.4 37.34 118.4 34.44 104.99 34.44 104.99 56.99"/><polygon class="cls-2" points="176.17 56.99 189.58 56.99 189.58 54.09 179.2 54.09 179.2 46.16 188.28 46.16 188.28 43.26 179.2 43.26 179.2 37.34 189.58 37.34 189.58 34.44 176.17 34.44 176.17 56.99"/><polygon class="cls-2" points="138.88 51.34 130.31 32.49 126.44 56.99 129.55 56.99 131.62 42.47 138.84 58.33 146.15 42.47 148.13 56.99 151.23 56.99 147.61 32.45 138.88 51.34"/><rect class="cls-2" x="161.31" y="34.44" width="3.03" height="22.55"/><path class="cls-2" d="M209,46.15A10.78,10.78,0,0,0,205.49,44l-2.12-.92a6.8,6.8,0,0,1-2.21-1.33,2,2,0,0,1-.73-1.69A3.07,3.07,0,0,1,203.82,37a3.62,3.62,0,0,1,2.28.69,4.87,4.87,0,0,1,1.2,1.55l.15.3,2.45-1.62-.12-.24a7,7,0,0,0-2.24-2.55,6.34,6.34,0,0,0-3.69-1c-3.8,0-6.45,2.45-6.45,6a4.86,4.86,0,0,0,1.6,3.8,9.51,9.51,0,0,0,2.84,1.78l2.15,1a9.5,9.5,0,0,1,2.56,1.46,3,3,0,0,1,1,2.35,4.2,4.2,0,0,1-7.06,2.92,4.93,4.93,0,0,1-1.24-2.64l-.05-.33-3,.82.06.28a8.32,8.32,0,0,0,2.13,4,6.74,6.74,0,0,0,5,1.87,6.91,6.91,0,0,0,7.24-7A5.58,5.58,0,0,0,209,46.15"/><polygon class="cls-2" points="0 56.99 3.35 56.99 10.49 40.18 17.43 56.81 17.5 56.99 20.86 56.99 10.56 32.93 0 56.99"/><polygon class="cls-2" points="50.21 56.99 53.57 56.99 60.71 40.18 67.64 56.81 67.72 56.99 71.07 56.99 60.78 32.93 50.21 56.99"/><path class="cls-2" d="M233.74,2.1a3.34,3.34,0,0,0-.93-.11,2.53,2.53,0,0,0-1.52.45,1.48,1.48,0,0,0-.63,1.28,2,2,0,0,0,.54,1.44,7.94,7.94,0,0,0,1.64,1.26,13.5,13.5,0,0,1,1.26.89,3.76,3.76,0,0,1,.83,1,2.62,2.62,0,0,1,.33,1.33,3.06,3.06,0,0,1-.5,1.74,3.26,3.26,0,0,1-1.4,1.18,5.06,5.06,0,0,1-2.09.41,8.3,8.3,0,0,1-1.94-.22,3.51,3.51,0,0,1-1.24-.46l.34-2.18h.92l.09,1.62a2.53,2.53,0,0,0,.81.33,3.86,3.86,0,0,0,1,.13,2.93,2.93,0,0,0,1.77-.53,1.68,1.68,0,0,0,.73-1.47,1.91,1.91,0,0,0-.49-1.34,6.42,6.42,0,0,0-1.49-1.16c-.52-.34-1-.65-1.32-.94a3.76,3.76,0,0,1-.9-1,2.64,2.64,0,0,1-.37-1.4,2.64,2.64,0,0,1,.5-1.62,3.23,3.23,0,0,1,1.35-1.08,4.58,4.58,0,0,1,1.86-.37,7,7,0,0,1,1.72.18,3.31,3.31,0,0,1,1.09.45l-.35,2h-.83l-.12-1.47a2.39,2.39,0,0,0-.68-.3"/><path class="cls-2" d="M241,5a2,2,0,0,0-1.35.54,3.66,3.66,0,0,0-.92,1.52,7,7,0,0,0-.33,2.24,3.52,3.52,0,0,0,.43,1.95,1.39,1.39,0,0,0,1.24.66,2.38,2.38,0,0,0,1.1-.24,5.05,5.05,0,0,0,1-.72l.3.57a3.84,3.84,0,0,1-1.14.95,3.43,3.43,0,0,1-1.76.43,2.44,2.44,0,0,1-2-.91,4,4,0,0,1-.73-2.54A6.43,6.43,0,0,1,237.34,7a5.3,5.3,0,0,1,1.55-2.08,3.74,3.74,0,0,1,2.42-.83,5,5,0,0,1,.93.09,3.09,3.09,0,0,1,.81.26l-.42,1.49-.26-.09A2.53,2.53,0,0,0,241,5"/><path class="cls-2" d="M246.1,11.61a.56.56,0,0,0,.07.29.21.21,0,0,0,.18.1.65.65,0,0,0,.34-.11,2.64,2.64,0,0,0,.44-.35l.2.37a2.88,2.88,0,0,1-.68.67,1.71,1.71,0,0,1-1.08.35,1.14,1.14,0,0,1-.78-.23.8.8,0,0,1-.22-.72c0-.25.15-1.25.4-3,.14-.93.31-2.16.52-3.7l-1-.35.09-.52,2.18-.36.34.17-1,7.22ZM246,2.15a.84.84,0,0,1-.23-.59,1.13,1.13,0,0,1,.3-.79.94.94,0,0,1,.71-.32.79.79,0,0,1,.61.24.77.77,0,0,1,.23.57,1.15,1.15,0,0,1-.29.81,1,1,0,0,1-.77.33.75.75,0,0,1-.56-.25"/><path class="cls-2" d="M254,12.43a3.75,3.75,0,0,1-1.95.52,3,3,0,0,1-1.72-.47,2.74,2.74,0,0,1-1-1.23A4,4,0,0,1,249,9.62a6.35,6.35,0,0,1,.59-2.75,5.08,5.08,0,0,1,1.63-2,3.7,3.7,0,0,1,2.29-.77,2.27,2.27,0,0,1,1.64.52A1.79,1.79,0,0,1,255.72,6a2.34,2.34,0,0,1-.89,1.84,5.79,5.79,0,0,1-2.08,1.12,8.1,8.1,0,0,1-2.15.4,3.42,3.42,0,0,0,.37,1.87,1.48,1.48,0,0,0,1.4.79,3.18,3.18,0,0,0,1.35-.32,3.75,3.75,0,0,0,1.21-.9l.34.57A4,4,0,0,1,254,12.43m-2.11-7A4.1,4.1,0,0,0,251,6.88a5.9,5.9,0,0,0-.39,1.69,5.31,5.31,0,0,0,1.62-.33,4,4,0,0,0,1.41-.87,1.76,1.76,0,0,0,.57-1.28,1.33,1.33,0,0,0-.29-.92,1,1,0,0,0-.77-.31,1.74,1.74,0,0,0-1.28.57"/><path class="cls-2" d="M261.24,4.62A3.14,3.14,0,0,1,263,4.06a1.67,1.67,0,0,1,1.32.52,2.61,2.61,0,0,1,.46,1.71,15.44,15.44,0,0,1-.34,2.34l-.06.36-.13.74a11.51,11.51,0,0,0-.24,1.85c0,.28.06.42.2.42a1.22,1.22,0,0,0,.72-.39l.18.4a1.54,1.54,0,0,1-.32.36,2.92,2.92,0,0,1-.61.39,1.73,1.73,0,0,1-.79.17.84.84,0,0,1-1-.93,12.88,12.88,0,0,1,.27-1.88l.14-.73.06-.37c.1-.55.19-1,.25-1.45a8.17,8.17,0,0,0,.09-1.16,1.67,1.67,0,0,0-.21-1,.87.87,0,0,0-.73-.27,2.33,2.33,0,0,0-1.37.61,5.75,5.75,0,0,0-1.3,1.47l-.75,5.54h-1.46l1-7.43L257.62,5l.12-.58,1.88-.34.32.17-.2,1.84a5.72,5.72,0,0,1,1.5-1.45"/><path class="cls-2" d="M270.77,5a2,2,0,0,0-1.35.54,3.66,3.66,0,0,0-.92,1.52,7,7,0,0,0-.33,2.24,3.52,3.52,0,0,0,.43,1.95,1.39,1.39,0,0,0,1.24.66,2.38,2.38,0,0,0,1.1-.24,5.05,5.05,0,0,0,1-.72l.3.57a3.84,3.84,0,0,1-1.14.95,3.43,3.43,0,0,1-1.76.43,2.44,2.44,0,0,1-2-.91,4,4,0,0,1-.73-2.54A6.43,6.43,0,0,1,267.13,7a5.3,5.3,0,0,1,1.55-2.08,3.76,3.76,0,0,1,2.42-.83,5,5,0,0,1,.93.09,3,3,0,0,1,.81.26l-.42,1.49-.26-.09A2.53,2.53,0,0,0,270.77,5"/><path class="cls-2" d="M278.66,12.43a3.75,3.75,0,0,1-2,.52,3,3,0,0,1-1.71-.47,2.7,2.7,0,0,1-1-1.23,4.19,4.19,0,0,1-.32-1.63,6.35,6.35,0,0,1,.59-2.75,5.17,5.17,0,0,1,1.63-2,3.7,3.7,0,0,1,2.29-.77,2.32,2.32,0,0,1,1.65.52A1.82,1.82,0,0,1,280.38,6a2.34,2.34,0,0,1-.89,1.84,5.79,5.79,0,0,1-2.08,1.12,8,8,0,0,1-2.15.4,3.51,3.51,0,0,0,.37,1.87A1.48,1.48,0,0,0,277,12a3.18,3.18,0,0,0,1.35-.32,3.75,3.75,0,0,0,1.21-.9l.34.57a4,4,0,0,1-1.27,1.11m-2.11-7a4.25,4.25,0,0,0-.87,1.45,6.25,6.25,0,0,0-.39,1.69,5.44,5.44,0,0,0,1.63-.33,4.05,4.05,0,0,0,1.4-.87,1.76,1.76,0,0,0,.57-1.28,1.33,1.33,0,0,0-.29-.92,1,1,0,0,0-.77-.31,1.74,1.74,0,0,0-1.28.57"/><path class="cls-2" d="M286.18,5.13a2.75,2.75,0,0,0-1.09-.21,1.85,1.85,0,0,0-1.13.31,1,1,0,0,0-.43.89,1.43,1.43,0,0,0,.34.93,6.08,6.08,0,0,0,1,.88,10.43,10.43,0,0,1,.88.74,3.1,3.1,0,0,1,.6.76,2.15,2.15,0,0,1,.26,1.05,2.09,2.09,0,0,1-.9,1.81,3.71,3.71,0,0,1-2.22.64,6.32,6.32,0,0,1-1.37-.15,2.1,2.1,0,0,1-.9-.34l.24-1.06a3.41,3.41,0,0,0,.88.44,3.37,3.37,0,0,0,1.18.21,2.21,2.21,0,0,0,1.15-.29,1,1,0,0,0,.48-.92,1.37,1.37,0,0,0-.38-1,6.83,6.83,0,0,0-1.1-.89,3.07,3.07,0,0,1-1.58-2.5,2.16,2.16,0,0,1,.4-1.27,2.64,2.64,0,0,1,1.09-.84,3.81,3.81,0,0,1,1.54-.3,6.32,6.32,0,0,1,1.13.1,4.07,4.07,0,0,1,.8.19l-.26,1.17a1.55,1.55,0,0,0-.6-.39"/><polygon class="cls-2" points="229.34 23.43 236.61 23.43 236.51 25.87 235.6 25.87 235.35 24.25 231.87 24.13 231.29 28.48 234.85 28.36 234.74 29.51 231.21 29.38 230.58 34.05 234.91 33.87 235.77 32.01 236.63 32.18 236.01 34.84 227.85 34.84 227.91 34.24 229.06 34.05 230.29 24.25 229.24 24.09 229.34 23.43"/><path class="cls-2" d="M242.18,26.67a3.16,3.16,0,0,1,1.73-.56,1.67,1.67,0,0,1,1.32.53,2.51,2.51,0,0,1,.46,1.7,14.42,14.42,0,0,1-.34,2.35l-.06.35-.12.74a10.81,10.81,0,0,0-.25,1.86c0,.27.07.41.2.41a1.15,1.15,0,0,0,.72-.38l.19.4a1.54,1.54,0,0,1-.32.35,2.46,2.46,0,0,1-.61.39,1.76,1.76,0,0,1-.79.18c-.65,0-1-.31-1-.94a11.94,11.94,0,0,1,.28-1.87l.14-.74.06-.37c.1-.55.18-1,.24-1.45a8.14,8.14,0,0,0,.1-1.16,1.64,1.64,0,0,0-.21-1,.87.87,0,0,0-.73-.27,2.3,2.3,0,0,0-1.38.61,5.67,5.67,0,0,0-1.29,1.46l-.76,5.55h-1.45l1-7.44-.76-.36.13-.59,1.87-.34.32.17-.2,1.85a5.77,5.77,0,0,1,1.5-1.46"/><path class="cls-2" d="M252.77,37.29a4,4,0,0,1-1.55,1.05,5.36,5.36,0,0,1-1.78.32,5.69,5.69,0,0,1-1-.09,3.45,3.45,0,0,1-.76-.19l.32-1.24a5,5,0,0,0,.9.34,3.56,3.56,0,0,0,1.06.17,2.22,2.22,0,0,0,1.45-.39,2.12,2.12,0,0,0,.63-1.41l.29-2a3.73,3.73,0,0,1-1,.84A2.61,2.61,0,0,1,250,35a2.16,2.16,0,0,1-1.89-.88,3.9,3.9,0,0,1-.64-2.35,6.52,6.52,0,0,1,.58-2.6A5.62,5.62,0,0,1,249.73,27a4.15,4.15,0,0,1,2.61-.87,4.47,4.47,0,0,1,.87.1,5.15,5.15,0,0,1,.8.24l1-.34-1.38,9.31a3.37,3.37,0,0,1-.81,1.87m-.61-10.36a2.36,2.36,0,0,0-1.75.74,4.82,4.82,0,0,0-1.07,1.85,7.16,7.16,0,0,0-.35,2.15,3.3,3.3,0,0,0,.37,1.72,1.16,1.16,0,0,0,1,.62,2.09,2.09,0,0,0,1.2-.39,3.12,3.12,0,0,0,.9-.87l.82-5.5a1.85,1.85,0,0,0-1.15-.32"/><path class="cls-2" d="M258.39,33.67a.45.45,0,0,0,.07.28.19.19,0,0,0,.17.1.6.6,0,0,0,.35-.11,3.13,3.13,0,0,0,.44-.35l.2.37a3.17,3.17,0,0,1-.69.68,1.77,1.77,0,0,1-1.08.35,1.14,1.14,0,0,1-.78-.24.82.82,0,0,1-.22-.71c0-.26.16-1.25.4-3,.15-.93.32-2.17.52-3.7l-.95-.36.09-.52,2.19-.35.33.17-1,7.21Zm-.07-9.46a.81.81,0,0,1-.24-.6,1.09,1.09,0,0,1,.3-.78.94.94,0,0,1,.72-.33.81.81,0,0,1,.61.24.82.82,0,0,1,.23.58,1.17,1.17,0,0,1-.29.8,1,1,0,0,1-.77.33.76.76,0,0,1-.56-.24"/><path class="cls-2" d="M265.74,26.67a3.11,3.11,0,0,1,1.72-.56,1.65,1.65,0,0,1,1.32.53,2.5,2.5,0,0,1,.47,1.7,15.68,15.68,0,0,1-.34,2.35l-.06.35-.13.74a11.6,11.6,0,0,0-.24,1.86c0,.27.06.41.2.41a1.2,1.2,0,0,0,.72-.38l.18.4a1.54,1.54,0,0,1-.32.35,2.28,2.28,0,0,1-.61.39,1.73,1.73,0,0,1-.79.18.84.84,0,0,1-1-.94,12.8,12.8,0,0,1,.27-1.87l.14-.74.06-.37c.1-.55.19-1,.25-1.45a8.07,8.07,0,0,0,.09-1.16,1.64,1.64,0,0,0-.21-1,.87.87,0,0,0-.73-.27,2.27,2.27,0,0,0-1.37.61,5.7,5.7,0,0,0-1.3,1.46l-.75,5.55h-1.46l1-7.44-.75-.36.12-.59,1.88-.34.32.17-.2,1.85a5.77,5.77,0,0,1,1.5-1.46"/><path class="cls-2" d="M276.11,34.48a3.7,3.7,0,0,1-1.95.52,3,3,0,0,1-1.71-.46,2.87,2.87,0,0,1-1-1.23,4.24,4.24,0,0,1-.32-1.64,6.53,6.53,0,0,1,.59-2.75,5.17,5.17,0,0,1,1.63-2,3.76,3.76,0,0,1,2.29-.77,2.32,2.32,0,0,1,1.65.53,1.76,1.76,0,0,1,.55,1.36,2.31,2.31,0,0,1-.88,1.84A5.83,5.83,0,0,1,274.87,31a9.08,9.08,0,0,1-2.15.4,3.49,3.49,0,0,0,.36,1.86,1.48,1.48,0,0,0,1.4.79,3.16,3.16,0,0,0,1.35-.31,3.9,3.9,0,0,0,1.22-.9l.33.57a3.93,3.93,0,0,1-1.27,1.1m-2.1-7a4.12,4.12,0,0,0-.88,1.44,6.37,6.37,0,0,0-.38,1.7,5.17,5.17,0,0,0,1.62-.34,3.78,3.78,0,0,0,1.4-.87,1.74,1.74,0,0,0,.57-1.28,1.31,1.31,0,0,0-.28-.91,1,1,0,0,0-.78-.32,1.68,1.68,0,0,0-1.27.58"/><path class="cls-2" d="M284,34.48a3.7,3.7,0,0,1-2,.52,3,3,0,0,1-1.71-.46,2.87,2.87,0,0,1-1-1.23,4.24,4.24,0,0,1-.32-1.64,6.53,6.53,0,0,1,.59-2.75,5.26,5.26,0,0,1,1.63-2,3.79,3.79,0,0,1,2.3-.77,2.31,2.31,0,0,1,1.64.53,1.76,1.76,0,0,1,.55,1.36,2.31,2.31,0,0,1-.88,1.84A5.74,5.74,0,0,1,282.73,31a9.08,9.08,0,0,1-2.15.4,3.4,3.4,0,0,0,.37,1.86,1.45,1.45,0,0,0,1.39.79,3.2,3.2,0,0,0,1.36-.31,3.86,3.86,0,0,0,1.21-.9l.34.57a4,4,0,0,1-1.28,1.1m-2.1-7a4.12,4.12,0,0,0-.88,1.44,6.37,6.37,0,0,0-.38,1.7,5.17,5.17,0,0,0,1.62-.34,3.7,3.7,0,0,0,1.4-.87,1.74,1.74,0,0,0,.57-1.28,1.31,1.31,0,0,0-.28-.91,1,1,0,0,0-.78-.32,1.7,1.7,0,0,0-1.27.58"/><path class="cls-2" d="M290.05,27.3a3.77,3.77,0,0,1,1-.83,2.34,2.34,0,0,1,1.22-.34.83.83,0,0,1,.5.11l-.33,1.62a1.45,1.45,0,0,0-.75-.15,2.3,2.3,0,0,0-1.29.44,2.89,2.89,0,0,0-1,1.22l-.7,5.47h-1.48l1-7.41-.77-.38.11-.57,1.81-.35.31.18-.11,1.37-.08.61a4.09,4.09,0,0,1,.6-1"/><path class="cls-2" d="M295.29,33.67a.45.45,0,0,0,.07.28.19.19,0,0,0,.17.1.6.6,0,0,0,.35-.11,3.13,3.13,0,0,0,.44-.35l.2.37a3.17,3.17,0,0,1-.69.68,1.77,1.77,0,0,1-1.08.35,1.14,1.14,0,0,1-.78-.24.82.82,0,0,1-.22-.71c0-.26.16-1.25.4-3,.15-.93.32-2.17.52-3.7l-.95-.36.09-.52,2.19-.35.33.17-1,7.21Zm-.07-9.46a.81.81,0,0,1-.24-.6,1.09,1.09,0,0,1,.3-.78.94.94,0,0,1,.72-.33.81.81,0,0,1,.61.24.82.82,0,0,1,.23.58,1.17,1.17,0,0,1-.29.8,1,1,0,0,1-.77.33.76.76,0,0,1-.56-.24"/><path class="cls-2" d="M302.33,26.67a3.14,3.14,0,0,1,1.73-.56,1.67,1.67,0,0,1,1.32.53,2.56,2.56,0,0,1,.46,1.7,15.68,15.68,0,0,1-.34,2.35l-.06.35-.12.74a10.81,10.81,0,0,0-.25,1.86c0,.27.07.41.2.41a1.2,1.2,0,0,0,.72-.38l.19.4a1.64,1.64,0,0,1-.33.35,2.22,2.22,0,0,1-.6.39,1.76,1.76,0,0,1-.79.18c-.65,0-1-.31-1-.94a12.8,12.8,0,0,1,.27-1.87l.14-.74.06-.37c.11-.55.19-1,.25-1.45a8.07,8.07,0,0,0,.09-1.16,1.73,1.73,0,0,0-.2-1,.88.88,0,0,0-.73-.27,2.3,2.3,0,0,0-1.38.61,5.7,5.7,0,0,0-1.3,1.46l-.75,5.55h-1.46l1-7.44-.75-.36.13-.59,1.87-.34.32.17-.2,1.85a5.77,5.77,0,0,1,1.5-1.46"/><path class="cls-2" d="M312.92,37.29a4,4,0,0,1-1.55,1.05,5.36,5.36,0,0,1-1.78.32,5.69,5.69,0,0,1-1-.09,3.57,3.57,0,0,1-.77-.19l.33-1.24a5,5,0,0,0,.9.34,3.51,3.51,0,0,0,1.06.17,2.22,2.22,0,0,0,1.45-.39,2.11,2.11,0,0,0,.62-1.41l.3-2a3.73,3.73,0,0,1-1,.84,2.63,2.63,0,0,1-1.33.34,2.16,2.16,0,0,1-1.89-.88,3.9,3.9,0,0,1-.64-2.35,6.35,6.35,0,0,1,.58-2.6A5.62,5.62,0,0,1,309.88,27a4.11,4.11,0,0,1,2.61-.87,4.56,4.56,0,0,1,.87.1,5.15,5.15,0,0,1,.8.24l.95-.34-1.38,9.31a3.37,3.37,0,0,1-.81,1.87m-.62-10.36a2.35,2.35,0,0,0-1.74.74,4.7,4.7,0,0,0-1.07,1.85,7.16,7.16,0,0,0-.35,2.15,3.3,3.3,0,0,0,.37,1.72,1.14,1.14,0,0,0,1,.62,2,2,0,0,0,1.19-.39,3.3,3.3,0,0,0,.91-.87l.82-5.5a1.88,1.88,0,0,0-1.16-.32"/><path class="cls-2" d="M237.11,49.24c.83-1.82,1.39-3.07,1.65-3.76h3.29l-.06.66-1.37.17-.29,9.8,1.31.18-.07.6h-4.22l.06-.6,1.4-.18.35-6.79.2-3.12L238.2,49l-3.57,8-.83.11-1.26-7.89-.47-2.92-.63,3-1.64,6.91,1.55.18-.06.6h-4l.06-.6,1.28-.18,2.47-9.8-1.41-.17.09-.66h3.56L234.56,53l.2,1.57.67-1.53c.28-.69.84-1.95,1.68-3.77"/><path class="cls-2" d="M247.75,56.54a3.75,3.75,0,0,1-1.95.52,3,3,0,0,1-1.71-.47,2.7,2.7,0,0,1-1-1.23,4.19,4.19,0,0,1-.32-1.63,6.35,6.35,0,0,1,.59-2.75,5.17,5.17,0,0,1,1.63-2,3.7,3.7,0,0,1,2.29-.77,2.32,2.32,0,0,1,1.65.52,1.82,1.82,0,0,1,.55,1.37,2.34,2.34,0,0,1-.89,1.84A5.79,5.79,0,0,1,246.5,53a8,8,0,0,1-2.15.4,3.51,3.51,0,0,0,.37,1.87,1.48,1.48,0,0,0,1.4.79,3.18,3.18,0,0,0,1.35-.32,3.75,3.75,0,0,0,1.21-.9l.34.57a4,4,0,0,1-1.27,1.11m-2.11-7a4.25,4.25,0,0,0-.87,1.45,6.25,6.25,0,0,0-.39,1.69,5.44,5.44,0,0,0,1.63-.33,4.05,4.05,0,0,0,1.4-.87A1.76,1.76,0,0,0,248,50.2a1.33,1.33,0,0,0-.29-.92,1,1,0,0,0-.77-.31,1.74,1.74,0,0,0-1.28.57"/><path class="cls-2" d="M257.17,55.72q0,.39.24.39a1.19,1.19,0,0,0,.7-.39l.22.39a3.42,3.42,0,0,1-.67.62,1.68,1.68,0,0,1-1,.31c-.6,0-.9-.32-.9-1v-.34a3.94,3.94,0,0,1-1.08.94,2.72,2.72,0,0,1-1.44.38,2.13,2.13,0,0,1-1.87-.88,4,4,0,0,1-.63-2.34,6.41,6.41,0,0,1,.58-2.62A5.56,5.56,0,0,1,253,49a4.1,4.1,0,0,1,2.61-.86,4,4,0,0,1,1.15.18l.41-2.76-1-.26.13-.54,2.16-.28.34.2-1.6,10.84a.79.79,0,0,0,0,.17M255.42,49a2.32,2.32,0,0,0-1.74.75,4.64,4.64,0,0,0-1.06,1.84,7.15,7.15,0,0,0-.34,2.16,3.44,3.44,0,0,0,.36,1.72,1.12,1.12,0,0,0,1,.61,2.06,2.06,0,0,0,1.23-.41,3.11,3.11,0,0,0,.9-.91l.83-5.42a1.94,1.94,0,0,0-1.2-.34"/><path class="cls-2" d="M262.14,55.72a.57.57,0,0,0,.06.29.24.24,0,0,0,.18.1.71.71,0,0,0,.35-.11,3.84,3.84,0,0,0,.44-.35l.19.37a2.88,2.88,0,0,1-.68.67,1.71,1.71,0,0,1-1.08.35,1.19,1.19,0,0,1-.78-.23.8.8,0,0,1-.22-.72c0-.25.15-1.25.4-3,.14-.93.32-2.16.52-3.7l-.95-.35.09-.52,2.18-.36.34.17-1,7.22Zm-.07-9.46a.81.81,0,0,1-.24-.6,1.12,1.12,0,0,1,.3-.78,1,1,0,0,1,.71-.32.83.83,0,0,1,.62.24.81.81,0,0,1,.23.57,1.2,1.2,0,0,1-.29.81,1,1,0,0,1-.77.33.73.73,0,0,1-.56-.25"/><path class="cls-2" d="M269.42,49.14a2,2,0,0,0-1.35.54,3.6,3.6,0,0,0-.92,1.52,7,7,0,0,0-.33,2.24,3.52,3.52,0,0,0,.43,2,1.39,1.39,0,0,0,1.24.66,2.38,2.38,0,0,0,1.1-.24,5.05,5.05,0,0,0,1-.72l.3.57a4,4,0,0,1-1.14,1A3.43,3.43,0,0,1,268,57a2.44,2.44,0,0,1-2-.91,4,4,0,0,1-.73-2.54,6.43,6.43,0,0,1,.53-2.51A5.3,5.3,0,0,1,267.33,49a3.69,3.69,0,0,1,2.42-.83,5,5,0,0,1,.93.09,3.09,3.09,0,0,1,.81.26L271.07,50l-.26-.09a2.53,2.53,0,0,0-1.39-.78"/><path class="cls-2" d="M274.77,55.72a.56.56,0,0,0,.07.29.24.24,0,0,0,.18.1.71.71,0,0,0,.35-.11,3.15,3.15,0,0,0,.43-.35l.2.37a2.88,2.88,0,0,1-.68.67,1.71,1.71,0,0,1-1.08.35,1.19,1.19,0,0,1-.78-.23.8.8,0,0,1-.22-.72c0-.25.15-1.25.4-3,.14-.93.32-2.16.52-3.7l-1-.35.09-.52,2.18-.36.34.17-1,7.22Zm-.07-9.46a.85.85,0,0,1-.23-.6,1.12,1.12,0,0,1,.3-.78.94.94,0,0,1,.71-.32.79.79,0,0,1,.61.24.78.78,0,0,1,.24.57,1.16,1.16,0,0,1-.3.81,1,1,0,0,1-.76.33.75.75,0,0,1-.57-.25"/><path class="cls-2" d="M282,48.73a3.09,3.09,0,0,1,1.73-.56,1.65,1.65,0,0,1,1.32.52,2.54,2.54,0,0,1,.46,1.7,15.09,15.09,0,0,1-.33,2.35l-.07.36-.12.73a11.6,11.6,0,0,0-.24,1.86c0,.28.06.42.19.42a1.22,1.22,0,0,0,.73-.39l.18.4a1.77,1.77,0,0,1-.32.36,3.21,3.21,0,0,1-.61.39,1.86,1.86,0,0,1-.79.17c-.64,0-1-.31-1-.93a13.42,13.42,0,0,1,.28-1.88l.14-.73.06-.37c.1-.56.18-1,.25-1.45a8.17,8.17,0,0,0,.09-1.16,1.67,1.67,0,0,0-.21-1,.87.87,0,0,0-.73-.27,2.31,2.31,0,0,0-1.37.61,5.58,5.58,0,0,0-1.3,1.47l-.75,5.54H278.2l1-7.43-.75-.37.12-.58,1.87-.34.33.17-.2,1.84A5.85,5.85,0,0,1,282,48.73"/><path class="cls-2" d="M292.42,56.54a3.75,3.75,0,0,1-1.95.52,3,3,0,0,1-1.71-.47,2.7,2.7,0,0,1-1-1.23,4.19,4.19,0,0,1-.32-1.63A6.35,6.35,0,0,1,288,51a5.17,5.17,0,0,1,1.63-2,3.7,3.7,0,0,1,2.29-.77,2.32,2.32,0,0,1,1.65.52,1.82,1.82,0,0,1,.55,1.37,2.34,2.34,0,0,1-.89,1.84A5.79,5.79,0,0,1,291.17,53a8,8,0,0,1-2.15.4,3.51,3.51,0,0,0,.37,1.87,1.48,1.48,0,0,0,1.4.79,3.18,3.18,0,0,0,1.35-.32,3.75,3.75,0,0,0,1.21-.9l.34.57a4,4,0,0,1-1.27,1.11m-2.11-7a4.25,4.25,0,0,0-.87,1.45,6.25,6.25,0,0,0-.39,1.69,5.44,5.44,0,0,0,1.63-.33,4.05,4.05,0,0,0,1.4-.87,1.76,1.76,0,0,0,.57-1.28,1.33,1.33,0,0,0-.29-.92,1,1,0,0,0-.77-.31,1.74,1.74,0,0,0-1.28.57"/></g></g> </svg> </a> </div> <div class='global-nav-nap-menu' id="header-large"> <div class="dropdown" id="sitelinks-mobile"> <button class="btn btn-secondary dropdown-toggle" type="button" id="dropdownMenuButton" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false"> <span class="hidden-xxs">Navigate to</span> </button> <div class="dropdown-menu" aria-labelledby="dropdownMenuButton"> <a class="dropdown-item" href="/content/help">Help</a> <a class="dropdown-item" href="/content/help-with-ordering">Ordering Information</a> <a class="dropdown-item" href="/new" >New Releases</a> <a class="dropdown-item" href="/author">Browse by Division</a> <a class="dropdown-item" href="/topic" class="site-links"> Browse by Topic</a> </div> </div> <ul class="user-links"> <li><a href="/"><span class="icon-menu" data-icon=""> </span> NAP Home</a></li> <li class="dropdown nap-mega-menu mega-dropdown"> <a href="#" class="dropdown-toggle" data-toggle="dropdown"><span class="icon-menu" data-icon=""> </span> Browse <span class="caret"></span></a> <ul class="dropdown-menu mega-dropdown-menu row" id="nap-mega-menu-inner"> <li class="d-flex" > <ul class="browse-col" > <li class="dropdown-header"><a href="/author">Publications by Division</a></li> <li><a href="/author/DBASSE/">Division of Behavioral and Social Sciences and Education</a> </li> <li><a href="/author/DELS/">Division on Earth and Life Studies</a></li> <li><a href="/author/DEPS/">Division on Engineering and Physical Sciences</a> </li> <li><a href="/author/GRP/">Gulf Research Program</a></li> <li><a href="/author/HMD/">Health and Medicine Division</a></li> <li><a href="/author/PGA/">Policy and Global Affairs</a></li> <li><a href="/author/TRB/">Transportation Research Board</a></li> <li><hr style="margin-left: 21px; margin-right: 20px;"></li> <li><a href="/author/NAS">National Academy of Sciences</a></li> <li><a href="/author/NAE">National Academy of Engineering</a></li> <li><a href="/author/NAM">National Academy of Medicine</a></li> </ul> <ul class="browse-col" > <li class="dropdown-header"><a href="/topic">Publications by Topic</a></li> <li><a href="/topic/276">Agriculture</a></li> <li><a href="/topic/277">Behavioral and Social Sciences</a></li> <li><a href="/topic/292">Biography and Autobiography</a></li> <li><a href="/topic/278">Biology and Life Sciences</a></li> <li><a href="/topic/279">Computers and Information Technology</a></li> <li><a href="/topic/280">Conflict and Security Issues</a></li> <li><a href="/topic/281">Earth Sciences</a></li> <li><a href="/topic/282">Education</a></li> <li><a href="/topic/283">Energy and Energy Conservation</a></li> <li><a href="/topic/284">Engineering and Technology</a></li> </ul> <ul class="browse-col"> <li><br> </li> <li><a href="/topic/285">Environment and Environmental Studies</a></li> <li><a href="/topic/287">Food and Nutrition</a></li> <li><a href="/topic/288">Health and Medicine</a></li> <li><a href="/topic/289">Industry and Labor</a></li> <li><a href="/topic/290">Math, Chemistry, and Physics</a></li> <li><a href="/topic/423">Policy for Science and Technology</a></li> <li><a href="/topic/293">Space and Aeronautics</a></li> <li><a href="/topic/478">Surveys and Statistics</a></li> <li><a href="/topic/294">Transportation and Infrastructure</a></li> </ul> <ul class="browse-col vertical-divider"> <li class="dropdown-header"><br></li> <li><a href="/collection">Searchable Collections</a></li> <li><a href="/new">New Releases</a></li> </ul> </li> </ul> </li> <li class="dropdown"> <a class="dropdown-toggle" data-toggle="dropdown" href="#"><span class="icon-menu" data-icon=""> </span> MyNAP <span class="caret"></span></a> <ul class="dropdown-menu"> <li><a href="/login.php" class="userOff"><span class="icon-menu" data-icon=""> </span> Login</a></li> <li><a href="/login.php?action=new" class="register"><span class="icon-menu" data-icon=""> </span> Register</a></li> </ul> </li> <li class="naphelp"><a href="/content/help"><span class="icon-menu" data-icon=""> </span> HELP</a></li> <li> <a href="/cart/cart.php"> <span class="icon-menu" data-icon=""> </span> Cart </a> </li> </ul> </div> <div class="global-nav__menus"> <div class="global-nav__menus--upper"> <div class="global-nav__controls"> <div class="controls__social"><!----></div> <button aria-label="Search" class="controls__search" onclick="toggleSearch()"><span class="search__label"> Search </span> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 30 30" class=""> <path d="M13.8 21.6a7.8 7.8 0 110-15.6 7.8 7.8 0 010 15.6zm0-2a5.8 5.8 0 100-11.6 5.8 5.8 0 000 11.6z"></path> <path d="M17.899 19.325l1.414-1.414 4.322 4.322-1.414 1.414z"></path> </svg> </button> <button class="controls__menu"> Menu <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 30 30" class=""> <path fill-rule="evenodd" d="M8 23h15v-2.5H8V23zm0-6.25h15v-2.5H8v2.5zM8 8v2.5h15V8H8z"></path> </svg> </button> <button class="controls__nav" onclick="toggleMenu(); myMenu(this)"> Global Menu <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 30 30" class="menu-off"> <path fill-rule="evenodd" d="M8 23h15v-2.5H8V23zm0-6.25h15v-2.5H8v2.5zM8 8v2.5h15V8H8z"></path> </svg> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 30 30" class="menu-on"><path fill-rule="evenodd" d="M20.728 8l1.818 1.818-5.455 5.455 5.455 5.455-1.818 1.818-5.455-5.455-5.455 5.455L8 20.728l5.455-5.455L8 9.818 9.818 8l5.455 5.455z"></path></svg> <!----></button> </div> </div> <div class="global-nav__menus--lower" > <nav role="navigation" class="global-nav__links " > <ul role="menu"> <li role="none" class="has-dropdown"><a href="https://www.nationalacademies.org/about" target="_self" role="menuitem" class="global-nav__link"><span> About Us </span></a> <div class="global-nav__dropdown"> <div class="dropdown__left"> <ul class="global-nav__links-widget" type="nas-nav-links-widget"> <li><a rel="" title="" href="https://www.nationalacademies.org/about" target="_self"> About Us </a></li> <li><a rel="" title="" href="https://www.nationalacademies.org/about/organization" target="_self"> Our Program Divisions </a></li> <li><a rel="" title="" href="https://www.nationalacademies.org/about/the-national-academies" target="_self"> Our Three Academies </a></li> <li><a rel="" title="" href="https://www.nationalacademies.org/about/leadership" target="_self"> Leadership </a></li> <li><a rel="" title="" href="https://www.nationalacademies.org/newsroom" target="_self"> Newsroom </a></li> <li><a rel="" title="" href="https://www.nationalacademies.org/ocga" target="_self"> Government Affairs </a></li> <li><a rel="" title="" href="https://www.nationalacademies.org/giving" target="_self"> Giving </a></li> <li><a rel="" title="" href="https://www.nationalacademies.org/about/institutional-policies-and-procedures/statement-on-diversity-and-inclusion" target="_self"> Statement on Diversity and Inclusion </a></li> </ul> </div> <div class="dropdown__right"> <p> <p>The National Academies of Sciences, Engineering, and Medicine are private, nonprofit institutions that provide expert advice on some of the most pressing challenges facing the nation and world. Our work helps shape sound policies, inform public opinion, and advance the pursuit of science, engineering, and medicine.</p> </p> <a rel="" title="Learn More" href="https://www.nationalacademies.org/about" target="_self" role="menuitem" class="button button--secondary button--outline button--icon"> Learn More <span class="button__icon"> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 30 30" class="w2 h2"> <path d="M17.885 10.708a1 1 0 111.412-1.416l5.624 5.608-5.616 5.732a1 1 0 11-1.428-1.4l4.228-4.316-4.22-4.208z"></path> <path d="M23.07 14a1 1 0 010 2H7a1 1 0 010-2h16.07z"></path> </svg> </span></a></div> </div> </li> <li role="none" class="has-dropdown"><a href="https://www.nationalacademies.org/events" target="_self" role="menuitem" class="global-nav__link"><span> Events </span></a> <div class="global-nav__dropdown"> <div class="dropdown__left"><span class="dropdown__left--default"><img src="https://nasemoceprodcomm-nationalacademies.cec.ocp.oraclecloud.com/content/published/api/v1.1/assets/CONTC88C4C0CA7CE4E7FA8630DEF6E1B3A8F/native/NAS+Building.jpg?cb=_cache_a061&channelToken=d2dc71410b56f1d61406108f1738d0f4" alt=""></span></div> <div class="dropdown__right"> <p> <p>Throughout any given year, the National Academies convene hundreds of conferences, workshops, symposia, forums, roundtables, and other gatherings that attract the finest minds in academia and the public and private sectors. These venues for discussion and debate are essential for allowing the scientific process to unfold.</p> </p> <a rel="" title="See All Events" href="https://www.nationalacademies.org/events" target="_self" role="menuitem" class="button button--secondary button--outline button--icon"> See All Events <span class="button__icon"> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 30 30" class="w2 h2"> <path d="M17.885 10.708a1 1 0 111.412-1.416l5.624 5.608-5.616 5.732a1 1 0 11-1.428-1.4l4.228-4.316-4.22-4.208z"></path> <path d="M23.07 14a1 1 0 010 2H7a1 1 0 010-2h16.07z"></path> </svg> </span></a></div> </div> </li> <li role="none" class="has-dropdown"><a href="https://www.nationalacademies.org/our-work" target="_self" role="menuitem" class="global-nav__link"><span> Our Work </span></a> <div class="global-nav__dropdown"> <div class="dropdown__left"> <ul class="global-nav__links-widget" type="nas-nav-links-widget"> <li><a rel="" title="" href="https://www.nationalacademies.org/our-work" target="_self"> Our Work </a></li> <li><a rel="" title="" href="https://www.nationalacademies.org/about/our-study-process" target="_self"> Our Study Process </a></li> <li><a rel="" title="" href="https://www.nationalacademies.org/about/institutional-policies-and-procedures/conflict-of-interest-policies-and-procedures" target="_self"> Conflict of Interest Policies and Procedures </a></li> <li><a rel="" title="" href="https://www.nationalacademies.org/about/institutional-policies-and-procedures/project-comments-and-information" target="_self"> Project Comments and Information </a></li> </ul> </div> <div class="dropdown__right"> <p> <p>The National Academies of Sciences, Engineering, and Medicine are the nation's pre-eminent source of high-quality, objective advice on science, engineering, and health matters. <br> <br> Top experts participate in our projects, activities, and studies to examine and assemble evidence-based findings to address some of society's greatest challenges.</p> </p> <a rel="" title="Learn More" href="https://www.nationalacademies.org/our-work" target="_self" role="menuitem" class="button button--secondary button--outline button--icon"> Learn More <span class="button__icon"> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 30 30" class="w2 h2"> <path d="M17.885 10.708a1 1 0 111.412-1.416l5.624 5.608-5.616 5.732a1 1 0 11-1.428-1.4l4.228-4.316-4.22-4.208z"></path> <path d="M23.07 14a1 1 0 010 2H7a1 1 0 010-2h16.07z"></path> </svg> </span></a></div> </div> </li> <li role="none" class="has-dropdown"><a href="https://www.nationalacademies.org/publications" target="_self" role="menuitem" class="global-nav__link"><span> Publications </span></a> <div class="global-nav__dropdown"> <div class="dropdown__left"> <ul class="global-nav__links-widget" loadchildren="true" type="nas-nav-links-widget"> <li><a rel="" title="" href="https://nap.nationalacademies.org/" target="_self"> Read Our Expert Reports and Published Proceedings </a></li> <li><a rel="" title="" href="https://www.pnas.org/" target="_self"> Explore PNAS, the Flagship Scientific Journal of NAS </a></li> <li><a rel="" title="" href="http://pubsindex.trb.org/" target="_self"> Access Transportation Research Board Publications </a></li> </ul> </div> <div class="dropdown__right"> <p>Our peer-reviewed reports present the evidence-based consensus of committees of experts. Published proceedings record the presentations and discussions that take place at hundreds of conferences, workshops, symposia, forums, roundtables, and other gatherings every year. And, our prestigious journals publish the latest scientific findings on a wide range of topics.</p> <a rel="" title="Learn More" href="https://www.nationalacademies.org/publications" target="_self" role="menuitem" class="button button--secondary button--outline button--icon"> Learn More <span class="button__icon"> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 30 30" class="w2 h2"> <path d="M17.885 10.708a1 1 0 111.412-1.416l5.624 5.608-5.616 5.732a1 1 0 11-1.428-1.4l4.228-4.316-4.22-4.208z"></path> <path d="M23.07 14a1 1 0 010 2H7a1 1 0 010-2h16.07z"></path> </svg> </span></a></div> </div> </li> <li role="none" class="has-dropdown"><a href="https://www.nationalacademies.org/topics" target="_self" role="menuitem" class="global-nav__link"><span> Topics </span></a> <div class="global-nav__dropdown"> <div class="dropdown__left"> <ul class="global-nav__links-widget" type="nas-nav-links-widget"> <li><a rel="" title="" href="https://www.nationalacademies.org/topics/covid-19-resources" target="_self"> Coronavirus Disease 2019 (COVID-19) </a></li> <li><a rel="" title="" href="https://www.nationalacademies.org/topics/resources-on-diversity-equity-and-inclusion" target="_self"> Diversity, Equity, and Inclusion </a></li> <li><a rel="" title="" href="https://www.nationalacademies.org/topics/climate" target="_self"> Climate </a></li> <li><a rel="" title="" href="https://www.nationalacademies.org/topics/economic-recovery" target="_self"> Economic Recovery </a></li> </ul> </div> <div class="dropdown__right"> <p> <p>Discover what the National Academies are doing in various topic areas to strengthen the fields of science, engineering, and medicine and their capacity to contribute to the well-being of our nation and the world.</p> </p> <a rel="" title="See All Topics" href="https://www.nationalacademies.org/topics" target="_self" role="menuitem" class="button button--secondary button--outline button--icon"> See All Topics <span class="button__icon"> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 30 30" class="w2 h2"> <path d="M17.885 10.708a1 1 0 111.412-1.416l5.624 5.608-5.616 5.732a1 1 0 11-1.428-1.4l4.228-4.316-4.22-4.208z"></path> <path d="M23.07 14a1 1 0 010 2H7a1 1 0 010-2h16.07z"></path> </svg> </span></a></div> </div> </li> <li role="none" class="has-dropdown"><a href="https://www.nationalacademies.org/engagement" target="_self" role="menuitem" class="global-nav__link"><span> Engagement </span></a> <div class="global-nav__dropdown"> <div class="dropdown__left"><span class="dropdown__left--default"><img src="https://nasemoceprodcomm-nationalacademies.ocecdn.oraclecloud.com/content/published/api/v1.1/assets/CONTC267CED7812243AB86410D548C73D067/native/engagement-nav.jpg?cb=_cache_a061&channelToken=d2dc71410b56f1d61406108f1738d0f4" alt=""></span></div> <div class="dropdown__right"> <p> <p>A powerful way to foster appreciation for the impact of science and critical and innovative thinking is through art and the humanities. Learn more about the National Academies’ various programs designed to connect, engage, and inspire.</p> </p> <a rel="" title="Learn More" href="https://www.nationalacademies.org/engagement" target="_self" role="menuitem" class="button button--secondary button--outline button--icon"> Learn More <span class="button__icon"> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 30 30" class="w2 h2"> <path d="M17.885 10.708a1 1 0 111.412-1.416l5.624 5.608-5.616 5.732a1 1 0 11-1.428-1.4l4.228-4.316-4.22-4.208z"></path> <path d="M23.07 14a1 1 0 010 2H7a1 1 0 010-2h16.07z"></path> </svg> </span></a></div> </div> </li> <li role="none" class="has-dropdown"><a href="https://www.nationalacademies.org/opportunities" target="_self" role="menuitem" class="global-nav__link"><span> Opportunities </span></a> <div class="global-nav__dropdown"> <div class="dropdown__left"> <ul class="global-nav__links-widget" type="nas-nav-links-widget"> <li><a rel="" title="" href="https://www.nationalacademies.org/careers" target="_self"> Careers </a></li> <li><a rel="" title="" href="https://www.nationalacademies.org/fellowships-and-grants" target="_self"> Fellowships and Grants </a></li> <li><a rel="" title="" href="https://www.nationalacademies.org/about/volunteers" target="_self"> Volunteers </a></li> <li><a rel="" title="" href="https://www.nationalacademies.org/about/sponsors" target="_self"> Sponsors </a></li> <li><a rel="" title="" href="https://www.nationalacademies.org/about/members" target="_self"> Members </a></li> </ul> </div> <div class="dropdown__right"> <p>Make a real impact on the scientific, engineering, and health-related challenges facing society. Whether as a sponsor or donor, a member or volunteer, or an employee or fellow, you can make a difference.</p> <a rel="" title="Learn More" href="https://www.nationalacademies.org/opportunities" target="_self" role="menuitem" class="button button--secondary button--outline button--icon"> Learn More <span class="button__icon"> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 30 30" class="w2 h2"> <path d="M17.885 10.708a1 1 0 111.412-1.416l5.624 5.608-5.616 5.732a1 1 0 11-1.428-1.4l4.228-4.316-4.22-4.208z"></path> <path d="M23.07 14a1 1 0 010 2H7a1 1 0 010-2h16.07z"></path> </svg> </span></a></div> </div> </li> </ul> </nav> </div> </div> </div> <!----></header> <a name="content"></a> <script> $(".controls__menu").click(function(){ $("#mobile-menu").toggle(); }); function toggleMenu() { var element = document.getElementById("lowerMenu"); element.classList.toggle("menu-is-hidden"); } function myMenu(x) { x.classList.toggle("invert"); } function toggleSearch() { var element = document.getElementById("lowerMenu"); element.classList.toggle("search-is-hidden"); } </script> <!--accordion--> <script> var acc = document.getElementsByClassName("accordion"); var i; for (i = 0; i < acc.length; i++) { acc[i].addEventListener("click", function() { this.classList.toggle("active"); var panel = this.nextElementSibling; if (panel.style.maxHeight) { panel.style.maxHeight = null; } else { panel.style.maxHeight = panel.scrollHeight + "px"; } }); } </script> <div itemscope itemtype="http://schema.org/Book"> <link itemprop="additionalType" href="http://schema.org/Product"/> <link itemprop="bookFormat" href="http://schema.org/Paperback"> <div class="heading-rows"> <div class="container" > <div class="mynap-promo visible-xs visible-sm hidden-md hidden-lg"><a href="https://nap.nationalacademies.org/login.php?record_id=27215"><strong>Login</strong></a> or <a href="/login.php?action=new"><strong>Register</strong></a> for a free MyNAP member account to save 10% off online and receive other benefits. [<a href="/content/using-mynap">Learn More</a>]</div> <div class="flex-row row"> <div class="row flex-row-actions"> <div class="results-author results-report-type"> <span data-placement="right" class="report-type" data-toggle="tooltip" data-container="body" title="Consensus Study Reports published by the National Academies of Sciences, Engineering, and Medicine document the evidence-based consensus on the study’s statement of task by an authoring committee of experts. Reports typically include findings, conclusions, and recommendations based on information gathered by the committee and the committee’s deliberations. Each report has been subjected to a rigorous and independent peer-review process and it represents the position of the National Academies on the statement of task."><em>Consensus Study Report </em> </span> </div> <div id="actions" > <div class="link-tools" style="padding-bottom: 20px;"> <!--<a class="btn btn-tool email-this" href="javascript:void(0)" onClick="window.open('/catalog/sendthis.php?record_id=27215','friend','directories=no,titlebar=no,toolbar=no,location=no,status=no,menubar=no,scrollbars=no,resizable=no,width=500,height=495');"> <span class="glyphicon glyphicon-send icon-link" style="color: #336699;"> </span> E-mail this page </a>--> </div> </div> </div> </div> <!-- /row 1 --> <div class="flex-row row2" style="padding-top:20px;"> <div class="flex-item cover"> <div id="cover" class="cover-block"><a href="https://nap.nationalacademies.org/read/27215" data-toggle="tooltip" title="Read Online" id="read-cov"> <img class="img-responsive img-cover150" src="https://nap.nationalacademies.org/cover/27215/450" alt="Nuclear Terrorism: Assessment of U.S. Strategies to Prevent, Counter, and Respond to Weapons of Mass Destruction" itemprop="image"></a> <div class="prepubbanner">Prepublication</div> </div> <div data-toggle="modal" data-target="#myCover" class="text-center"> <p class="btn btn-text" style="color: #4148C2; font-size: 12px; cursor: pointer; margin-top: 5px;">VIEW LARGER COVER</p></div> <div class="modal fade" id="myCover" tabindex="-1" role="dialog" aria-labelledby="myCoverLabel" aria-hidden="true"> <div class="modal-dialog modal-lg" role="document"> <div class="modal-content"> <div class="modal-header" style="border-bottom: none"> <button type="button" class="close" data-dismiss="modal" aria-label="Close"> <span aria-hidden="true" style="color: black;">×</span> </button> </div> <div class="modal-body text-center"> <img class="img-fluid img-responsive" src="https://nap.nationalacademies.org/cover/27215/450" alt="Nuclear Terrorism: Assessment of U.S. Strategies to Prevent, Counter, and Respond to Weapons of Mass Destruction" itemprop="image"> </div> <div class="modal-footer"> <button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button> </div> </div> </div> </div> </div> <div class="flex-item book-details" > <div class="row"> <div id="titleblock"> <a href="https://nap.nationalacademies.org/read/27215"> <h1 class="catalog-title">Nuclear Terrorism</h1> <h2 class="catalog-subtitle">Assessment of U.S. Strategies to Prevent, Counter, and Respond to Weapons of Mass Destruction </h2> </a> <div class="bookyear"> <span itemprop="copyrightYear">(2024)</span></div> </div> </div> <!-- /title --> <div class="row"> <div class="book-actions flex-row-btnbuy"> <div class="btn-buy-top"><a href="https://nap.nationalacademies.org/login.php?record_id=27215" class="btn btn-primary action-button action-download">Download Free PDF</a></div> <div class="btn-buy-top"><a href="https://nap.nationalacademies.org/read/27215" class="btn btn-primary action-button action-read">Read Free Online</a></div> <div class="btn-buy-top"><a href="https://nap.nationalacademies.org/cart/cart.php?list=fs&action=buy%20it&record_id=27215&isbn=0-309-70868-0" class="btn btn-clear" itemprop="offers" itemscope itemtype="http://schema.org/Offer"><span class="icon-purchase" data-icon=""> </span> <link itemprop="availability" href="http://schema.org/InStock"> Pre-order Paperback: <span class="nonmynap-price" itemprop="price">$30.00</span> <meta itemprop="priceCurrency" content="USD"> </a><br> </div> </div> </div> <!-- book formats and purchase options --> <div class="row"> <div id="descriptionblock"> <div class="book-description" itemprop="description"><p>For nearly eight decades, the world has been navigating the dangers of the nuclear age. Despite Cold War tensions and the rise of global terrorism, nuclear weapons have not been used in conflict since Hiroshima and Nagasaki in 1945. Efforts such as strategic deterrence, arms control and non-proliferation agreements, and the U.S.-led global counterterrorism have helped to keep nuclear incidents at bay. However, the nation's success to date in countering nuclear terrorism does not come with a guarantee, success often carries the risk that other challenges will siphon away attention and resources and can lead to the perception that the threat no longer exists.</p> <p>This report found that U.S. efforts to counter nuclear or radiological terrorism are not keeping pace with the evolving threat landscape. The U.S. government should maintain a strategic focus and effort on combatting terrorism across the national security community in coordination with international partners, State, Local, Tribal and Territorial authorities, the National Laboratories, universities and colleges, and civil society. Developing and sustaining adequate nuclear incident response and recovery capabilities at the local and state levels will likely require significant new investments in resources and empowerment of local response from Federal Emergency Management Agency (FEMA), working with the Centers for Disease Control and Prevention, Environmental Protection Agency, Department of Energy, and National Institutes of Health.</p> </div> </div> </div> <!-- /description --> <!-- authors --> <div class="row"> <div id="contributorblock"> <div class="book-author" itemprop="author"><b>Contributor(s): </b> National Academies of Sciences, Engineering, and Medicine; <a href="/author/DELS">Division on Earth and Life Studies</a>; <a href="/author/NRSB">Nuclear and Radiation Studies Board</a>; <a href="/initiative/committee-on-assessing-and-improving-strategies-for-preventing-countering-and-responding-to-weapons-of-mass-destruction-terrorism-nuclear-threats">Committee on Assessing and Improving Strategies for Preventing, Countering, and Responding to Weapons of Mass Destruction Terrorism: Nuclear Threats</a> </div> </div> </div> <!-- /authors --> <!-- share tools --> <div class="social-share"> <span class="social-share--title"> Share </span> <div class="social-share--networks" style="cursor: pointer;"> <a onclick="Share.linkedin('https://nap.nationalacademies.org/catalog/27215','Nuclear\u0020Terrorism: Assessment\u0020of\u0020U.S.\u0020Strategies\u0020to\u0020Prevent,\u0020Counter,\u0020and\u0020Respond\u0020to\u0020Weapons\u0020of\u0020Mass\u0020Destruction')"> <span tabindex="0" data-link="#share-linkedin" class="connect-linkedin"> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 30 30" class="" title="LinkedIn"> <path fill-rule="evenodd" d="M7 23V10.533h3.4V23H7zm12.467-12.467c2.558 0 4.533 2.034 4.533 5.665V23h-3.4v-6.347c0-1.586-.779-2.679-2.192-2.679-1.082 0-1.94.736-2.223 1.443-.097.251-.118.608-.118.959V23h-3.4s.088-11.333.035-12.467h3.365l-.04 2.267c.516-1.133 1.335-2.267 3.44-2.267zM10.4 7.7a1.7 1.7 0 11-3.4 0 1.7 1.7 0 013.4 0z"></path> </svg> </span> </a> <a onclick="Share.twitter('https://nap.nationalacademies.org/catalog/27215','Nuclear\u0020Terrorism: Assessment\u0020of\u0020U.S.\u0020Strategies\u0020to\u0020Prevent,\u0020Counter,\u0020and\u0020Respond\u0020to\u0020Weapons\u0020of\u0020Mass\u0020Destruction')"> <span tabindex="0" data-link="#share-twitter" class="connect-twitter"> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 30 30" class="" title="Twitter"> <path fill-rule="evenodd" d="M24 9.775a7.238 7.238 0 01-2.121.598 3.787 3.787 0 001.625-2.096 7.253 7.253 0 01-2.347.92A3.65 3.65 0 0018.461 8c-2.04 0-3.695 1.697-3.695 3.787 0 .298.033.586.096.863-3.07-.157-5.793-1.665-7.615-3.956a3.853 3.853 0 00-.499 1.904c0 1.313.853 2.472 1.845 3.151-.606-.02-1.473-.191-1.473-.475v.05c0 1.833 1.072 3.363 2.761 3.712-.31.086-.736.133-1.072.133a3.99 3.99 0 01-.746-.07c.47 1.505 1.81 2.6 3.425 2.632A7.343 7.343 0 016 21.299 10.277 10.277 0 0011.66 23c6.795 0 10.51-5.77 10.51-10.774 0-.163-.005-.328-.013-.491A7.588 7.588 0 0024 9.775"></path> </svg> </span> </a> <a onclick="Share.facebook('https://nap.nationalacademies.org/catalog/27215','Nuclear\u0020Terrorism: Assessment\u0020of\u0020U.S.\u0020Strategies\u0020to\u0020Prevent,\u0020Counter,\u0020and\u0020Respond\u0020to\u0020Weapons\u0020of\u0020Mass\u0020Destruction')"> <span tabindex="0" data-link="#share-facebook" class="connect-facebook"> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 30 30" class="" title="Facebook"> <path fill-rule="evenodd" d="M20 9.375h-2.222c-.334 0-1.111.531-1.111 1.125v2.25H20v3.375h-3.333V24h-3.334v-7.875H10V12.75h3.333V10.5c0-2.482 2.18-4.5 4.515-4.5H20v3.375"></path> </svg> </span> </a> <a href="mailto:?subject=Nuclear Terrorism: Assessment of U.S. Strategies to Prevent, Counter, and Respond to Weapons of Mass Destruction&body=Read%20online,%20download%20a%20free%20PDF,%20or%20order%20a%20copy%20in%20print%20or%20as%20an%20eBook https://nap.nationalacademies.org/catalog/27215" title="Share by Email"> <span tabindex="0" class="connect-email"> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 30 30" class="" title="Email"> <path fill-rule="evenodd" d="M6 12.964v4.569c0 .296.197.386.439.2l2.822-2.15c.243-.184.243-.484 0-.669l-2.822-2.15c-.242-.185-.439-.095-.439.2zM7.125 9C6.506 9 6 9.601 6 10.071l8.514 6.455a.775.775 0 00.882.002L24 10.07C24 9.601 23.494 9 22.875 9H7.125zm13.613 6.584l2.822 2.15c.243.185.44.095.44-.201v-4.569c0-.295-.197-.385-.44-.2l-2.822 2.15c-.242.185-.242.485 0 .67zM18.26 16.8l-2.822 2.15a.764.764 0 01-.879 0l-2.822-2.15a.765.765 0 00-.88-.001L6 20.495v.29c0 .471.506 1.072 1.125 1.072h15.75c.619 0 1.125-.6 1.125-1.071v-.29L19.141 16.8a.767.767 0 00-.88.001z"></path> </svg> </span> </a> </div> </div> <!-- /share tools --> </div> <!-- /book-details --> <div class="flex-item rel-info"> <div class="mynap-promo hidden-xs"><a href="https://nap.nationalacademies.org/login.php?record_id=27215"><strong>Login</strong></a> or <a href="/login.php?action=new"><strong>Register</strong></a> for a free MyNAP member account to save 10% off online and receive other benefits. [<a href="/content/using-mynap">Learn More</a>]</div> <h1>RESOURCES AT A GLANCE</h1> <ul class="resource-list"> <li class="pdfdoc"><i class="las la-minus"></i><a href="https://nap.nationalacademies.org/resource/27215/NRSB_Nuclear_Assessment_US_Strategies_Highlights.pdf">Highlights</a></li> <li class="htmldoc"><i class="las la-minus"></i><a href="https://www.nationalacademies.org/news/2024/06/new-reports-evaluate-u-s-readiness-to-prevent-counter-and-respond-to-threats-of-nuclear-and-chemical-weapons-of-mass-destruction">Press Release</a></li> </ul> <div class="clearfix"></div> <div class="clearfix"></div> <div class="clearfix"></div> </div> <!-- /resources --> </div> <!-- /row 2 --> </div> <!--/ container --> </div> </div> <div class="clearfix"></div> </div> <div class="middle-rows"> <div class="container" > <button class="cp-accordion">Additional Book Information</button> <div class="panel" style="max-height: 100%"> <div class="overview"> <div class="flex-row"> <div class="flex-item overview"> <h3>Topics</h3> <ul class="book-topics"> <li><a href="/topic/328"><span class="icon-328"></span><span itemprop="about">Conflict and Security Issues</span> — Prevention, Security and Response </a></li> <li><a href="/topic/326"><span class="icon-326"></span> Conflict and Security Issues — Military and Defense Studies </a></li> <li><a href="/topic/327"><span class="icon-327"></span> Conflict and Security Issues — Policy, Reviews and Evaluations </a></li> </ul> </div> <div class="flex-item overview"> <h3>Suggested Citation</h3> <div class="citation-string"> <blockquote> National Academies of Sciences, Engineering, and Medicine. 2024. <em>Nuclear Terrorism: Assessment of U.S. Strategies to Prevent, Counter, and Respond to Weapons of Mass Destruction</em>. Washington, DC: The National Academies Press. https://doi.org/10.17226/27215.</div> <h4 class="citation-subheading">Import this citation to:</h4> <ul class="citation-formats"> <li><a href="/citation.php?type=bibtex&record_id=27215">Bibtex</a></li> <li><a href="/citation.php?type=enw&record_id=27215">EndNote</a></li> <li><a href="/citation.php?type=ris&record_id=27215">Reference Manager</a></li> </ul> </blockquote> </div> <div class="flex-item overview"> <h3>Publication Info</h3> <span itemprop="numberOfPages"> 158</span> pages | 7 x 10 | Paperback <br> ISBN: <span itemprop="isbn"> 978-0-309-70868-5</span><br> DOI: <a href="https://doi.org/10.17226/27215">https://doi.org/10.17226/27215</a><br> </div> </div> </div> </div> <button class="cp-accordion">Contents</button> <div class="panel" style="max-height: 100%"> <div id="toc"> <div class="flex-row toc" style="align-items: flex-start;"> <div class="flex-item toclist"> <table class="table"> <thead> <tr> <th>Chapters</th> <td></td> <th class="key-chapskim" >skim</th> </tr> </thead> <tbody> <tr> <td class="chapter-name"><a href="https://nap.nationalacademies.org/read/27215/chapter/1">Front Matter</a></td> <td class="chapter-page-range">i-xxvi</td> <td class="chapter-skim"><a href="/skim.php?record_id=27215&chap=i-xxvi" class="btn btn-sm btn-skim" title="skim this chapter"><span class="glyphicon glyphicon-eye-open icon-skim"></span></a></td> </tr> <tr> <td class="chapter-name"><a href="https://nap.nationalacademies.org/read/27215/chapter/2">Executive Summary</a></td> <td class="chapter-page-range">1-2</td> <td class="chapter-skim"><a href="/skim.php?record_id=27215&chap=1-2" class="btn btn-sm btn-skim" title="skim this chapter"><span class="glyphicon glyphicon-eye-open icon-skim"></span></a></td> </tr> <tr> <td class="chapter-name"><a href="https://nap.nationalacademies.org/read/27215/chapter/3">Summary</a></td> <td class="chapter-page-range">3-13</td> <td class="chapter-skim"><a href="/skim.php?record_id=27215&chap=3-13" class="btn btn-sm btn-skim" title="skim this chapter"><span class="glyphicon glyphicon-eye-open icon-skim"></span></a></td> </tr> <tr> <td class="chapter-name"><a href="https://nap.nationalacademies.org/read/27215/chapter/4">1 Background and Study Task</a></td> <td class="chapter-page-range">14-23</td> <td class="chapter-skim"><a href="/skim.php?record_id=27215&chap=14-23" class="btn btn-sm btn-skim" title="skim this chapter"><span class="glyphicon glyphicon-eye-open icon-skim"></span></a></td> </tr> <tr> <td class="chapter-name"><a href="https://nap.nationalacademies.org/read/27215/chapter/5">2 Nuclear Terrorism Threats</a></td> <td class="chapter-page-range">24-39</td> <td class="chapter-skim"><a href="/skim.php?record_id=27215&chap=24-39" class="btn btn-sm btn-skim" title="skim this chapter"><span class="glyphicon glyphicon-eye-open icon-skim"></span></a></td> </tr> <tr> <td class="chapter-name"><a href="https://nap.nationalacademies.org/read/27215/chapter/6">3 New Dynamics in Nuclear Terrorism Pose New Risks</a></td> <td class="chapter-page-range">40-53</td> <td class="chapter-skim"><a href="/skim.php?record_id=27215&chap=40-53" class="btn btn-sm btn-skim" title="skim this chapter"><span class="glyphicon glyphicon-eye-open icon-skim"></span></a></td> </tr> <tr> <td class="chapter-name"><a href="https://nap.nationalacademies.org/read/27215/chapter/7">4 Geo-political and Other Changes Eroding Longstanding Nuclear Security Norms and Practices</a></td> <td class="chapter-page-range">54-61</td> <td class="chapter-skim"><a href="/skim.php?record_id=27215&chap=54-61" class="btn btn-sm btn-skim" title="skim this chapter"><span class="glyphicon glyphicon-eye-open icon-skim"></span></a></td> </tr> <tr> <td class="chapter-name"><a href="https://nap.nationalacademies.org/read/27215/chapter/8">5 The Evolving Civil Nuclear Sector: Adapting Approaches and New Opportunities</a></td> <td class="chapter-page-range">62-71</td> <td class="chapter-skim"><a href="/skim.php?record_id=27215&chap=62-71" class="btn btn-sm btn-skim" title="skim this chapter"><span class="glyphicon glyphicon-eye-open icon-skim"></span></a></td> </tr> <tr> <td class="chapter-name"><a href="https://nap.nationalacademies.org/read/27215/chapter/9">6 The Risks Associated with Highly Enriched Uranium and Plutonium</a></td> <td class="chapter-page-range">72-81</td> <td class="chapter-skim"><a href="/skim.php?record_id=27215&chap=72-81" class="btn btn-sm btn-skim" title="skim this chapter"><span class="glyphicon glyphicon-eye-open icon-skim"></span></a></td> </tr> <tr> <td class="chapter-name"><a href="https://nap.nationalacademies.org/read/27215/chapter/10">7 Managing the Risks and Benefits of Radioactive Sources</a></td> <td class="chapter-page-range">82-91</td> <td class="chapter-skim"><a href="/skim.php?record_id=27215&chap=82-91" class="btn btn-sm btn-skim" title="skim this chapter"><span class="glyphicon glyphicon-eye-open icon-skim"></span></a></td> </tr> <tr> <td class="chapter-name"><a href="https://nap.nationalacademies.org/read/27215/chapter/11">8 Detection and Interdiction Efforts Within and Outside the Global Supply System</a></td> <td class="chapter-page-range">92-103</td> <td class="chapter-skim"><a href="/skim.php?record_id=27215&chap=92-103" class="btn btn-sm btn-skim" title="skim this chapter"><span class="glyphicon glyphicon-eye-open icon-skim"></span></a></td> </tr> <tr> <td class="chapter-name"><a href="https://nap.nationalacademies.org/read/27215/chapter/12">9 Response and Recovery to Nuclear Incidents</a></td> <td class="chapter-page-range">104-115</td> <td class="chapter-skim"><a href="/skim.php?record_id=27215&chap=104-115" class="btn btn-sm btn-skim" title="skim this chapter"><span class="glyphicon glyphicon-eye-open icon-skim"></span></a></td> </tr> <tr> <td class="chapter-name"><a href="https://nap.nationalacademies.org/read/27215/chapter/13">Appendix A: Presentations at the Committee's Public Information-Gathering Sessions</a></td> <td class="chapter-page-range">116-120</td> <td class="chapter-skim"><a href="/skim.php?record_id=27215&chap=116-120" class="btn btn-sm btn-skim" title="skim this chapter"><span class="glyphicon glyphicon-eye-open icon-skim"></span></a></td> </tr> <tr> <td class="chapter-name"><a href="https://nap.nationalacademies.org/read/27215/chapter/14">Appendix B: Five Eras of Nuclear Terrorism</a></td> <td class="chapter-page-range">121-125</td> <td class="chapter-skim"><a href="/skim.php?record_id=27215&chap=121-125" class="btn btn-sm btn-skim" title="skim this chapter"><span class="glyphicon glyphicon-eye-open icon-skim"></span></a></td> </tr> <tr> <td class="chapter-name"><a href="https://nap.nationalacademies.org/read/27215/chapter/15">Appendix C: Committee, Consultant, and Staff Biographies</a></td> <td class="chapter-page-range">126-132</td> <td class="chapter-skim"><a href="/skim.php?record_id=27215&chap=126-132" class="btn btn-sm btn-skim" title="skim this chapter"><span class="glyphicon glyphicon-eye-open icon-skim"></span></a></td> </tr> </tbody> </table> </div> <div class="flex-item "> <div class="searchob"></div> <div class="searchobfaq"> <h3><span class="glyphicon glyphicon-eye-open icon-skim"></span>What is skim?</h3> <p>The Chapter Skim search tool presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter. You may select key terms to highlight them within pages of each chapter.</p> </div> </div> </div> </div> </div> <button class="cp-accordion" >Resources</button> <div class="panel" style="max-height: 100%"> <a name="resources"></a> <div class="flex-row"></div> <div class="flex-row"> <div class="flex-item"> <ul class="resource-list"> <li class="pdfdoc"><a href="https://nap.nationalacademies.org/resource/27215/NRSB_Nuclear_Assessment_US_Strategies_Highlights.pdf">Highlights</a></li> <li class="htmldoc"><a href="https://www.nationalacademies.org/news/2024/06/new-reports-evaluate-u-s-readiness-to-prevent-counter-and-respond-to-threats-of-nuclear-and-chemical-weapons-of-mass-destruction">Press Release</a></li> </ul> <div class="clearfix"></div> </div> </div> <!--/resources panel --> </div> <button class="cp-accordion">Rights and Permissions </button> <div class="panel" style="max-height: 100%"> <div class="flex-item full-width" > <h3><span class="icon-heading" data-icon=""></span>Copyright Information</h3> <p>The National Academies Press (NAP) has partnered with Copyright Clearance Center's Marketplace service to offer you a variety of options for reusing NAP content. Through Marketplace, you may request permission to reprint NAP content in another publication, course pack, secure website, or other media. Marketplace allows you to instantly obtain permission, pay related fees, and print a license directly from the NAP website. The complete terms and conditions of your reuse license can be found in the license agreement that will be made available to you during the online order process. To request permission through Marketplace you are required to create an account by filling out a simple online form. The following list describes license reuses offered by the NAP through Marketplace:</p> <ul class="list-circle"> <li>Republish text, tables, figures, or images in print</li> <li>Post on a secure Intranet/Extranet website</li> <li>Use in a PowerPoint Presentation</li> <li>Distribute via CD-ROM</li> <li>Photocopy</li> </ul> <p><a href="https://marketplace.copyright.com/rs-ui-web/mp/search/all/10.17226%2F27215" target="_blank"><span class="icon-heading" data-icon=""></span>Click here to obtain permission for the above reuses.</a> If you have questions or comments concerning the Marketplace service, please contact:</p> <blockquote>Marketplace Support <br> International +1.978.646.2600<br> US Toll Free +1.855.239.3415<br> E-mail: support@copyright.com<br> marketplace.copyright.com </blockquote> <p>To request permission to distribute a PDF, please contact our Customer Service Department at <a href="mailto:customer_service@nap.edu">customer_service@nap.edu</a>. </p> </div> <!--/rights and permissions--> </div> <button class="cp-accordion">Stats</button> <div class="panel" style="max-height: 100%"> <div class="altmetric-embed" id="stats"><img src="/images/loading.gif" style="padding-right: 15px;" alt="loading icon">Loading stats for <em>Nuclear Terrorism: Assessment of U.S. Strategies to Prevent, Counter, and Respond to Weapons of Mass Destruction</em>...</p> </div> <!-- /stats --> </div> </div> <!-- Modal - What is a prepub? --> <div class="modal fade" id="pp-modal" tabindex="-1" role="dialog" aria-labelledby="ppModalLabel" aria-hidden="true"> <div class="modal-dialog"> <div class="modal-content"> <div class="modal-header"> <button type="button" class="close" data-dismiss="modal"><span aria-hidden="true">×</span><span class="sr-only">Close</span></button> <h4 class="modal-title">What is a prepublication?</h4> </div> <div class="modal-body"><img src="/images/icon_prepubprocess.png" alt="What is a prepublication image" border="0" class="img-responsive"> <p>An uncorrected copy, or prepublication, is an uncorrected proof of the book. We publish prepublications to facilitate timely access to the committee's findings.</p> </div> <div class="modal-footer"> <button type="button" class="btn btn-default" data-dismiss="modal">Close</button> </div> </div> </div> </div> <!-- / prepub modal --> <!-- Modal - What happens when I preorder? --> <div class="modal fade" id="po-modal" tabindex="-1" role="dialog" aria-labelledby="poModalLabel" aria-hidden="true"> <div class="modal-dialog"> <div class="modal-content"> <div class="modal-header"> <button type="button" class="close" data-dismiss="modal"><span aria-hidden="true">×</span><span class="sr-only">Close</span></button> <h4 class="modal-title">What happens when I pre-order?</h4> </div> <div class="modal-body"> <p>The final version of this book has not been published yet. You can pre-order a copy of the book and we will send it to you when it becomes available. We will not charge you for the book until it ships. Pricing for a pre-ordered book is estimated and subject to change. All backorders will be released at the final established price. As a courtesy, if the price increases by more than $3.00 we will notify you.<br> <br> If the price decreases, we will simply charge the lower price.<br> <br> Applicable discounts will be extended.</p> </div> <div class="modal-footer"> <button type="button" class="btn btn-default" data-dismiss="modal">Close</button> </div> </div> </div> </div> <!-- / preorder modal --> <!-- Modal - What is an Ebook? --> <div class="modal fade" id="ebook-modal" tabindex="-1" role="dialog" aria-labelledby="ppModalLabel" aria-hidden="true"> <div class="modal-dialog"> <div class="modal-content"> <div class="modal-header"> <button type="button" class="close" data-dismiss="modal"><span aria-hidden="true">×</span><span class="sr-only">Close</span></button> <h4 class="modal-title">Downloading and Using eBooks from NAP</h4> </div> <div class="modal-body"> <h4>What is an eBook?</h4> <p>An ebook is one of two file formats that are intended to be used with e-reader devices and apps such as Amazon Kindle or Apple iBooks.</p> <h4>Why is an eBook better than a PDF?</h4> <p>A PDF is a digital representation of the print book, so while it can be loaded into most e-reader programs, it doesn't allow for resizable text or advanced, interactive functionality. The eBook is optimized for e-reader devices and apps, which means that it offers a much better digital reading experience than a PDF, including resizable text and interactive features (when available).</p> <h4>Where do I get eBook files?</h4> <p>eBook files are now available for a large number of reports on the NAP.edu website. If an eBook is available, you'll see the option to purchase it on the book page.</p> <p><a href="/content/download-and-using-ebooks-from-nap" target="_blank">View more FAQ's about Ebooks</a></p> </div> <div class="modal-footer"> <button type="button" class="btn btn-default" data-dismiss="modal">Close</button> </div> </div> </div> </div> <!-- / ebook modal --> <!-- Modal - What is a publication type? --> <div class="modal fade" id="type-modal" tabindex="-1" role="dialog" aria-labelledby="typeModalLabel" aria-hidden="true"> <div class="modal-dialog"> <div class="modal-content"> <div class="modal-header"> <button type="button" class="close" data-dismiss="modal"><span aria-hidden="true">×</span><span class="sr-only">Close</span></button> <h4 class="modal-title">Types of Publications</h4> </div> <div class="modal-body"> <p><strong>Consensus Study Report: </strong> Consensus Study Reports published by the National Academies of Sciences, Engineering, and Medicine document the evidence-based consensus on the study’s statement of task by an authoring committee of experts. Reports typically include findings, conclusions, and recommendations based on information gathered by the committee and the committee’s deliberations. Each report has been subjected to a rigorous and independent peer-review process and it represents the position of the National Academies on the statement of task.</p> </div> <div class="modal-footer"> <button type="button" class="btn btn-default" data-dismiss="modal">Close</button> </div> </div> </div> </div> <!-- / pub type modal --> </div> </div> </div> <div id="related-books-rows" class="container"> <p class="alert alert-info">Finding similar items...<img src="/images/loading.gif" class="pull-right"></p> </div><br> <!--start NAP footer --> <footer class="global-footer" style="background: #211747; border-top: none" id="global-footer-nap"> <div class="container"> <div class="global-footer__orgs"> <div class="global-footer__logo"> <a href="https://nap.nationalacademies.org"><img src="/images/footer-nap-text.png" alt="National Academies Press: Washington, DC | Home" class="img-responsive"></a> </div> <div> <form id="subscribe-form" action="/updates/" method="POST"> <input type="hidden" name="action" value="subscribe"> <div class="input-group"> <label for="email" class="sr-only">Email Address</label> <input type="hidden" name="SOURCE" value="homepage"> <input class="subscribe-input form-control" type="text" name="EMAIL" id="email" placeholder="Sign up for e-mail updates" title="Enter your e-mail address to subscribe to updates from NAP."> <span class="subscribe-button"> <button type="submit" class="btn btn-subscribe">Subscribe</button> </span> </div> </form></div></div> <div class="global-footer__links"> <ul class="global-footer__nav"> <li> <h6>NAP Quick Links</h6> <ul> <li><a href="/">Home</a></li> <li><a href="/content/about-the-national-academies-press">About</a></li> <li><a href="https://notes.nap.edu/">Notes from NAP</a></li> </ul> <h6>Request A</h6> <ul> <li><a href="/content/request-desk-copies">Desk Copy</a> </li> <li><a href="/content/request/exam_copy.html">Exam Copy </a></li> <li><a href="/content/request-review-copies">Review Copy</a></li> <li><a href="/content/request-rights-and-permissions">Reprint Permission</a></li> </ul> </li> <li> <h6>Browse Publications</h6> <ul> <li><a href="/author">By Division</a></li> <li><a href="/new/">By New Releases</a></li> <li><a href="/collection">By Searchable Collections</a></li> <li><a href="/topic">By Topic</a></li> </ul> </li> <li> <h6>NAP Ordering</h6> <ul> <li><a href="/content/contact-customer-service">Contact Customer Service</a></li> </ul> <h6>Using NAP.edu</h6> <ul> <li><a href="/content/searching-nap-publications">Tips for Searching</a> </li> <li><a href="/content/using-mynap">Help With MyNAP</a></li> <li><a href="/content/about-pdfs">Downloading and Reading PDFs</a> </li> </ul> </li> <li> <h6>NAP Information</h6> <ul> <li><a href="/content/help-with-discounts">Discounts</a></li> <li><a href="/content/information-for-book-trade-customers">Book Trade Customers</a></li> <li><a href="/content/request-rights-and-permissions">Rights and Permissions</a></li> <li><a href="/content/international-ordering-and-distribution">International Ordering and Distribution</a></li> <li><a href="/content/translation-rights">Translation Rights</a></li> </ul></li> </ul> </div></div></footer> <!--start NASEM footer --> <footer class="global-footer" style="background: #666; border-top: none"><div class="container"><div class="global-footer__orgs"><div class="global-footer__logo"> <a aria-label="Logo of The National Academies" href="https://www.nationalacademies.org/home"> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 315.11 58.33"><defs><style>.cls-1{fill:#fff;}</style></defs><g id="Layer_2" data-name="Layer 2"><g id="Layer_1-2" data-name="Layer 1"><polygon class="cls-1" points="3.73 7.55 20.84 25.49 20.84 1.5 17.81 1.5 17.81 18.08 0.7 0.14 0.7 24.06 3.73 24.06 3.73 7.55"/><polygon class="cls-1" points="28.49 24.06 31.84 24.06 38.98 7.25 45.92 23.87 45.99 24.06 49.34 24.06 39.05 0 28.49 24.06"/><polygon class="cls-1" points="153.23 24.06 156.58 24.06 163.72 7.25 170.66 23.87 170.73 24.06 174.08 24.06 163.79 0 153.23 24.06"/><polygon class="cls-1" points="59.72 24.06 62.76 24.06 62.76 4.41 69.52 4.41 69.52 1.5 52.96 1.5 52.96 4.41 59.72 4.41 59.72 24.06"/><rect class="cls-1" x="78.85" y="1.5" width="3.03" height="22.55"/><path class="cls-1" d="M115.69,12.8a11.72,11.72,0,0,0-23.44,0,11.72,11.72,0,0,0,23.44,0m-3.09,0A8.63,8.63,0,1,1,104,4a8.7,8.7,0,0,1,8.63,8.76"/><polygon class="cls-1" points="128.29 7.55 145.4 25.49 145.4 1.5 142.37 1.5 142.37 18.08 125.25 0.14 125.25 24.06 128.29 24.06 128.29 7.55"/><polygon class="cls-1" points="184.65 1.5 181.62 1.5 181.62 24.06 193.7 24.06 193.7 21.16 184.65 21.16 184.65 1.5"/><path class="cls-1" d="M37.15,34.08A11.48,11.48,0,0,0,25.37,45.8,11.36,11.36,0,0,0,37,57.38a11.77,11.77,0,0,0,6.79-2.19l.13-.09V51.2l-.51.51A9.77,9.77,0,0,1,41,53.5a8.9,8.9,0,0,1-3.95,1A8.75,8.75,0,0,1,37,37a9.09,9.09,0,0,1,3.66.82,10.71,10.71,0,0,1,2.78,2l.51.5V36.4l-.12-.09a10.62,10.62,0,0,0-6.67-2.23"/><path class="cls-1" d="M91.91,37.08a12.19,12.19,0,0,0-8.29-2.64H78.85V57h4.74c3.72,0,6-.73,8.22-2.61a10.75,10.75,0,0,0,4-8.65,11,11,0,0,0-3.86-8.65m-2.09,15.1a9.11,9.11,0,0,1-6.1,1.91H81.88V37.34h1.84c5.44,0,9,3.29,9,8.39a8.09,8.09,0,0,1-2.85,6.45"/><polygon class="cls-1" points="104.99 56.99 118.4 56.99 118.4 54.09 108.02 54.09 108.02 46.16 117.11 46.16 117.11 43.26 108.02 43.26 108.02 37.34 118.4 37.34 118.4 34.44 104.99 34.44 104.99 56.99"/><polygon class="cls-1" points="176.17 56.99 189.58 56.99 189.58 54.09 179.2 54.09 179.2 46.16 188.28 46.16 188.28 43.26 179.2 43.26 179.2 37.34 189.58 37.34 189.58 34.44 176.17 34.44 176.17 56.99"/><polygon class="cls-1" points="138.88 51.34 130.31 32.49 126.44 56.99 129.55 56.99 131.62 42.47 138.84 58.33 146.15 42.47 148.13 56.99 151.23 56.99 147.61 32.45 138.88 51.34"/><rect class="cls-1" x="161.31" y="34.44" width="3.03" height="22.55"/><path class="cls-1" d="M209,46.15A10.78,10.78,0,0,0,205.49,44l-2.12-.92a6.8,6.8,0,0,1-2.21-1.33,2,2,0,0,1-.73-1.69A3.07,3.07,0,0,1,203.82,37a3.62,3.62,0,0,1,2.28.69,4.87,4.87,0,0,1,1.2,1.55l.15.3,2.45-1.62-.12-.24a7,7,0,0,0-2.24-2.55,6.34,6.34,0,0,0-3.69-1c-3.8,0-6.45,2.45-6.45,6a4.86,4.86,0,0,0,1.6,3.8,9.51,9.51,0,0,0,2.84,1.78l2.15,1a9.5,9.5,0,0,1,2.56,1.46,3,3,0,0,1,1,2.35,4.2,4.2,0,0,1-7.06,2.92,4.93,4.93,0,0,1-1.24-2.64l-.05-.33-3,.82.06.28a8.32,8.32,0,0,0,2.13,4,6.74,6.74,0,0,0,5,1.87,6.91,6.91,0,0,0,7.24-7A5.58,5.58,0,0,0,209,46.15"/><polygon class="cls-1" points="0 56.99 3.35 56.99 10.49 40.18 17.43 56.81 17.5 56.99 20.86 56.99 10.56 32.93 0 56.99"/><polygon class="cls-1" points="50.21 56.99 53.57 56.99 60.71 40.18 67.64 56.81 67.72 56.99 71.07 56.99 60.78 32.93 50.21 56.99"/><path class="cls-1" d="M233.74,2.1a3.34,3.34,0,0,0-.93-.11,2.53,2.53,0,0,0-1.52.45,1.48,1.48,0,0,0-.63,1.28,2,2,0,0,0,.54,1.44,7.94,7.94,0,0,0,1.64,1.26,13.5,13.5,0,0,1,1.26.89,3.76,3.76,0,0,1,.83,1,2.62,2.62,0,0,1,.33,1.33,3.06,3.06,0,0,1-.5,1.74,3.26,3.26,0,0,1-1.4,1.18,5.06,5.06,0,0,1-2.09.41,8.3,8.3,0,0,1-1.94-.22,3.51,3.51,0,0,1-1.24-.46l.34-2.18h.92l.09,1.62a2.53,2.53,0,0,0,.81.33,3.86,3.86,0,0,0,1,.13,2.93,2.93,0,0,0,1.77-.53,1.68,1.68,0,0,0,.73-1.47,1.91,1.91,0,0,0-.49-1.34,6.42,6.42,0,0,0-1.49-1.16c-.52-.34-1-.65-1.32-.94a3.76,3.76,0,0,1-.9-1,2.64,2.64,0,0,1-.37-1.4,2.64,2.64,0,0,1,.5-1.62,3.23,3.23,0,0,1,1.35-1.08,4.58,4.58,0,0,1,1.86-.37,7,7,0,0,1,1.72.18,3.31,3.31,0,0,1,1.09.45l-.35,2h-.83l-.12-1.47a2.39,2.39,0,0,0-.68-.3"/><path class="cls-1" d="M241,5a2,2,0,0,0-1.35.54,3.66,3.66,0,0,0-.92,1.52,7,7,0,0,0-.33,2.24,3.52,3.52,0,0,0,.43,1.95,1.39,1.39,0,0,0,1.24.66,2.38,2.38,0,0,0,1.1-.24,5.05,5.05,0,0,0,1-.72l.3.57a3.84,3.84,0,0,1-1.14.95,3.43,3.43,0,0,1-1.76.43,2.44,2.44,0,0,1-2-.91,4,4,0,0,1-.73-2.54A6.43,6.43,0,0,1,237.34,7a5.3,5.3,0,0,1,1.55-2.08,3.74,3.74,0,0,1,2.42-.83,5,5,0,0,1,.93.09,3.09,3.09,0,0,1,.81.26l-.42,1.49-.26-.09A2.53,2.53,0,0,0,241,5"/><path class="cls-1" d="M246.1,11.61a.56.56,0,0,0,.07.29.21.21,0,0,0,.18.1.65.65,0,0,0,.34-.11,2.64,2.64,0,0,0,.44-.35l.2.37a2.88,2.88,0,0,1-.68.67,1.71,1.71,0,0,1-1.08.35,1.14,1.14,0,0,1-.78-.23.8.8,0,0,1-.22-.72c0-.25.15-1.25.4-3,.14-.93.31-2.16.52-3.7l-1-.35.09-.52,2.18-.36.34.17-1,7.22ZM246,2.15a.84.84,0,0,1-.23-.59,1.13,1.13,0,0,1,.3-.79.94.94,0,0,1,.71-.32.79.79,0,0,1,.61.24.77.77,0,0,1,.23.57,1.15,1.15,0,0,1-.29.81,1,1,0,0,1-.77.33.75.75,0,0,1-.56-.25"/><path class="cls-1" d="M254,12.43a3.75,3.75,0,0,1-1.95.52,3,3,0,0,1-1.72-.47,2.74,2.74,0,0,1-1-1.23A4,4,0,0,1,249,9.62a6.35,6.35,0,0,1,.59-2.75,5.08,5.08,0,0,1,1.63-2,3.7,3.7,0,0,1,2.29-.77,2.27,2.27,0,0,1,1.64.52A1.79,1.79,0,0,1,255.72,6a2.34,2.34,0,0,1-.89,1.84,5.79,5.79,0,0,1-2.08,1.12,8.1,8.1,0,0,1-2.15.4,3.42,3.42,0,0,0,.37,1.87,1.48,1.48,0,0,0,1.4.79,3.18,3.18,0,0,0,1.35-.32,3.75,3.75,0,0,0,1.21-.9l.34.57A4,4,0,0,1,254,12.43m-2.11-7A4.1,4.1,0,0,0,251,6.88a5.9,5.9,0,0,0-.39,1.69,5.31,5.31,0,0,0,1.62-.33,4,4,0,0,0,1.41-.87,1.76,1.76,0,0,0,.57-1.28,1.33,1.33,0,0,0-.29-.92,1,1,0,0,0-.77-.31,1.74,1.74,0,0,0-1.28.57"/><path class="cls-1" d="M261.24,4.62A3.14,3.14,0,0,1,263,4.06a1.67,1.67,0,0,1,1.32.52,2.61,2.61,0,0,1,.46,1.71,15.44,15.44,0,0,1-.34,2.34l-.06.36-.13.74a11.51,11.51,0,0,0-.24,1.85c0,.28.06.42.2.42a1.22,1.22,0,0,0,.72-.39l.18.4a1.54,1.54,0,0,1-.32.36,2.92,2.92,0,0,1-.61.39,1.73,1.73,0,0,1-.79.17.84.84,0,0,1-1-.93,12.88,12.88,0,0,1,.27-1.88l.14-.73.06-.37c.1-.55.19-1,.25-1.45a8.17,8.17,0,0,0,.09-1.16,1.67,1.67,0,0,0-.21-1,.87.87,0,0,0-.73-.27,2.33,2.33,0,0,0-1.37.61,5.75,5.75,0,0,0-1.3,1.47l-.75,5.54h-1.46l1-7.43L257.62,5l.12-.58,1.88-.34.32.17-.2,1.84a5.72,5.72,0,0,1,1.5-1.45"/><path class="cls-1" d="M270.77,5a2,2,0,0,0-1.35.54,3.66,3.66,0,0,0-.92,1.52,7,7,0,0,0-.33,2.24,3.52,3.52,0,0,0,.43,1.95,1.39,1.39,0,0,0,1.24.66,2.38,2.38,0,0,0,1.1-.24,5.05,5.05,0,0,0,1-.72l.3.57a3.84,3.84,0,0,1-1.14.95,3.43,3.43,0,0,1-1.76.43,2.44,2.44,0,0,1-2-.91,4,4,0,0,1-.73-2.54A6.43,6.43,0,0,1,267.13,7a5.3,5.3,0,0,1,1.55-2.08,3.76,3.76,0,0,1,2.42-.83,5,5,0,0,1,.93.09,3,3,0,0,1,.81.26l-.42,1.49-.26-.09A2.53,2.53,0,0,0,270.77,5"/><path class="cls-1" d="M278.66,12.43a3.75,3.75,0,0,1-2,.52,3,3,0,0,1-1.71-.47,2.7,2.7,0,0,1-1-1.23,4.19,4.19,0,0,1-.32-1.63,6.35,6.35,0,0,1,.59-2.75,5.17,5.17,0,0,1,1.63-2,3.7,3.7,0,0,1,2.29-.77,2.32,2.32,0,0,1,1.65.52A1.82,1.82,0,0,1,280.38,6a2.34,2.34,0,0,1-.89,1.84,5.79,5.79,0,0,1-2.08,1.12,8,8,0,0,1-2.15.4,3.51,3.51,0,0,0,.37,1.87A1.48,1.48,0,0,0,277,12a3.18,3.18,0,0,0,1.35-.32,3.75,3.75,0,0,0,1.21-.9l.34.57a4,4,0,0,1-1.27,1.11m-2.11-7a4.25,4.25,0,0,0-.87,1.45,6.25,6.25,0,0,0-.39,1.69,5.44,5.44,0,0,0,1.63-.33,4.05,4.05,0,0,0,1.4-.87,1.76,1.76,0,0,0,.57-1.28,1.33,1.33,0,0,0-.29-.92,1,1,0,0,0-.77-.31,1.74,1.74,0,0,0-1.28.57"/><path class="cls-1" d="M286.18,5.13a2.75,2.75,0,0,0-1.09-.21,1.85,1.85,0,0,0-1.13.31,1,1,0,0,0-.43.89,1.43,1.43,0,0,0,.34.93,6.08,6.08,0,0,0,1,.88,10.43,10.43,0,0,1,.88.74,3.1,3.1,0,0,1,.6.76,2.15,2.15,0,0,1,.26,1.05,2.09,2.09,0,0,1-.9,1.81,3.71,3.71,0,0,1-2.22.64,6.32,6.32,0,0,1-1.37-.15,2.1,2.1,0,0,1-.9-.34l.24-1.06a3.41,3.41,0,0,0,.88.44,3.37,3.37,0,0,0,1.18.21,2.21,2.21,0,0,0,1.15-.29,1,1,0,0,0,.48-.92,1.37,1.37,0,0,0-.38-1,6.83,6.83,0,0,0-1.1-.89,3.07,3.07,0,0,1-1.58-2.5,2.16,2.16,0,0,1,.4-1.27,2.64,2.64,0,0,1,1.09-.84,3.81,3.81,0,0,1,1.54-.3,6.32,6.32,0,0,1,1.13.1,4.07,4.07,0,0,1,.8.19l-.26,1.17a1.55,1.55,0,0,0-.6-.39"/><polygon class="cls-1" points="229.34 23.43 236.61 23.43 236.51 25.87 235.6 25.87 235.35 24.25 231.87 24.13 231.29 28.48 234.85 28.36 234.74 29.51 231.21 29.38 230.58 34.05 234.91 33.87 235.77 32.01 236.63 32.18 236.01 34.84 227.85 34.84 227.91 34.24 229.06 34.05 230.29 24.25 229.24 24.09 229.34 23.43"/><path class="cls-1" d="M242.18,26.67a3.16,3.16,0,0,1,1.73-.56,1.67,1.67,0,0,1,1.32.53,2.51,2.51,0,0,1,.46,1.7,14.42,14.42,0,0,1-.34,2.35l-.06.35-.12.74a10.81,10.81,0,0,0-.25,1.86c0,.27.07.41.2.41a1.15,1.15,0,0,0,.72-.38l.19.4a1.54,1.54,0,0,1-.32.35,2.46,2.46,0,0,1-.61.39,1.76,1.76,0,0,1-.79.18c-.65,0-1-.31-1-.94a11.94,11.94,0,0,1,.28-1.87l.14-.74.06-.37c.1-.55.18-1,.24-1.45a8.14,8.14,0,0,0,.1-1.16,1.64,1.64,0,0,0-.21-1,.87.87,0,0,0-.73-.27,2.3,2.3,0,0,0-1.38.61,5.67,5.67,0,0,0-1.29,1.46l-.76,5.55h-1.45l1-7.44-.76-.36.13-.59,1.87-.34.32.17-.2,1.85a5.77,5.77,0,0,1,1.5-1.46"/><path class="cls-1" d="M252.77,37.29a4,4,0,0,1-1.55,1.05,5.36,5.36,0,0,1-1.78.32,5.69,5.69,0,0,1-1-.09,3.45,3.45,0,0,1-.76-.19l.32-1.24a5,5,0,0,0,.9.34,3.56,3.56,0,0,0,1.06.17,2.22,2.22,0,0,0,1.45-.39,2.12,2.12,0,0,0,.63-1.41l.29-2a3.73,3.73,0,0,1-1,.84A2.61,2.61,0,0,1,250,35a2.16,2.16,0,0,1-1.89-.88,3.9,3.9,0,0,1-.64-2.35,6.52,6.52,0,0,1,.58-2.6A5.62,5.62,0,0,1,249.73,27a4.15,4.15,0,0,1,2.61-.87,4.47,4.47,0,0,1,.87.1,5.15,5.15,0,0,1,.8.24l1-.34-1.38,9.31a3.37,3.37,0,0,1-.81,1.87m-.61-10.36a2.36,2.36,0,0,0-1.75.74,4.82,4.82,0,0,0-1.07,1.85,7.16,7.16,0,0,0-.35,2.15,3.3,3.3,0,0,0,.37,1.72,1.16,1.16,0,0,0,1,.62,2.09,2.09,0,0,0,1.2-.39,3.12,3.12,0,0,0,.9-.87l.82-5.5a1.85,1.85,0,0,0-1.15-.32"/><path class="cls-1" d="M258.39,33.67a.45.45,0,0,0,.07.28.19.19,0,0,0,.17.1.6.6,0,0,0,.35-.11,3.13,3.13,0,0,0,.44-.35l.2.37a3.17,3.17,0,0,1-.69.68,1.77,1.77,0,0,1-1.08.35,1.14,1.14,0,0,1-.78-.24.82.82,0,0,1-.22-.71c0-.26.16-1.25.4-3,.15-.93.32-2.17.52-3.7l-.95-.36.09-.52,2.19-.35.33.17-1,7.21Zm-.07-9.46a.81.81,0,0,1-.24-.6,1.09,1.09,0,0,1,.3-.78.94.94,0,0,1,.72-.33.81.81,0,0,1,.61.24.82.82,0,0,1,.23.58,1.17,1.17,0,0,1-.29.8,1,1,0,0,1-.77.33.76.76,0,0,1-.56-.24"/><path class="cls-1" d="M265.74,26.67a3.11,3.11,0,0,1,1.72-.56,1.65,1.65,0,0,1,1.32.53,2.5,2.5,0,0,1,.47,1.7,15.68,15.68,0,0,1-.34,2.35l-.06.35-.13.74a11.6,11.6,0,0,0-.24,1.86c0,.27.06.41.2.41a1.2,1.2,0,0,0,.72-.38l.18.4a1.54,1.54,0,0,1-.32.35,2.28,2.28,0,0,1-.61.39,1.73,1.73,0,0,1-.79.18.84.84,0,0,1-1-.94,12.8,12.8,0,0,1,.27-1.87l.14-.74.06-.37c.1-.55.19-1,.25-1.45a8.07,8.07,0,0,0,.09-1.16,1.64,1.64,0,0,0-.21-1,.87.87,0,0,0-.73-.27,2.27,2.27,0,0,0-1.37.61,5.7,5.7,0,0,0-1.3,1.46l-.75,5.55h-1.46l1-7.44-.75-.36.12-.59,1.88-.34.32.17-.2,1.85a5.77,5.77,0,0,1,1.5-1.46"/><path class="cls-1" d="M276.11,34.48a3.7,3.7,0,0,1-1.95.52,3,3,0,0,1-1.71-.46,2.87,2.87,0,0,1-1-1.23,4.24,4.24,0,0,1-.32-1.64,6.53,6.53,0,0,1,.59-2.75,5.17,5.17,0,0,1,1.63-2,3.76,3.76,0,0,1,2.29-.77,2.32,2.32,0,0,1,1.65.53,1.76,1.76,0,0,1,.55,1.36,2.31,2.31,0,0,1-.88,1.84A5.83,5.83,0,0,1,274.87,31a9.08,9.08,0,0,1-2.15.4,3.49,3.49,0,0,0,.36,1.86,1.48,1.48,0,0,0,1.4.79,3.16,3.16,0,0,0,1.35-.31,3.9,3.9,0,0,0,1.22-.9l.33.57a3.93,3.93,0,0,1-1.27,1.1m-2.1-7a4.12,4.12,0,0,0-.88,1.44,6.37,6.37,0,0,0-.38,1.7,5.17,5.17,0,0,0,1.62-.34,3.78,3.78,0,0,0,1.4-.87,1.74,1.74,0,0,0,.57-1.28,1.31,1.31,0,0,0-.28-.91,1,1,0,0,0-.78-.32,1.68,1.68,0,0,0-1.27.58"/><path class="cls-1" d="M284,34.48a3.7,3.7,0,0,1-2,.52,3,3,0,0,1-1.71-.46,2.87,2.87,0,0,1-1-1.23,4.24,4.24,0,0,1-.32-1.64,6.53,6.53,0,0,1,.59-2.75,5.26,5.26,0,0,1,1.63-2,3.79,3.79,0,0,1,2.3-.77,2.31,2.31,0,0,1,1.64.53,1.76,1.76,0,0,1,.55,1.36,2.31,2.31,0,0,1-.88,1.84A5.74,5.74,0,0,1,282.73,31a9.08,9.08,0,0,1-2.15.4,3.4,3.4,0,0,0,.37,1.86,1.45,1.45,0,0,0,1.39.79,3.2,3.2,0,0,0,1.36-.31,3.86,3.86,0,0,0,1.21-.9l.34.57a4,4,0,0,1-1.28,1.1m-2.1-7a4.12,4.12,0,0,0-.88,1.44,6.37,6.37,0,0,0-.38,1.7,5.17,5.17,0,0,0,1.62-.34,3.7,3.7,0,0,0,1.4-.87,1.74,1.74,0,0,0,.57-1.28,1.31,1.31,0,0,0-.28-.91,1,1,0,0,0-.78-.32,1.7,1.7,0,0,0-1.27.58"/><path class="cls-1" d="M290.05,27.3a3.77,3.77,0,0,1,1-.83,2.34,2.34,0,0,1,1.22-.34.83.83,0,0,1,.5.11l-.33,1.62a1.45,1.45,0,0,0-.75-.15,2.3,2.3,0,0,0-1.29.44,2.89,2.89,0,0,0-1,1.22l-.7,5.47h-1.48l1-7.41-.77-.38.11-.57,1.81-.35.31.18-.11,1.37-.08.61a4.09,4.09,0,0,1,.6-1"/><path class="cls-1" d="M295.29,33.67a.45.45,0,0,0,.07.28.19.19,0,0,0,.17.1.6.6,0,0,0,.35-.11,3.13,3.13,0,0,0,.44-.35l.2.37a3.17,3.17,0,0,1-.69.68,1.77,1.77,0,0,1-1.08.35,1.14,1.14,0,0,1-.78-.24.82.82,0,0,1-.22-.71c0-.26.16-1.25.4-3,.15-.93.32-2.17.52-3.7l-.95-.36.09-.52,2.19-.35.33.17-1,7.21Zm-.07-9.46a.81.81,0,0,1-.24-.6,1.09,1.09,0,0,1,.3-.78.94.94,0,0,1,.72-.33.81.81,0,0,1,.61.24.82.82,0,0,1,.23.58,1.17,1.17,0,0,1-.29.8,1,1,0,0,1-.77.33.76.76,0,0,1-.56-.24"/><path class="cls-1" d="M302.33,26.67a3.14,3.14,0,0,1,1.73-.56,1.67,1.67,0,0,1,1.32.53,2.56,2.56,0,0,1,.46,1.7,15.68,15.68,0,0,1-.34,2.35l-.06.35-.12.74a10.81,10.81,0,0,0-.25,1.86c0,.27.07.41.2.41a1.2,1.2,0,0,0,.72-.38l.19.4a1.64,1.64,0,0,1-.33.35,2.22,2.22,0,0,1-.6.39,1.76,1.76,0,0,1-.79.18c-.65,0-1-.31-1-.94a12.8,12.8,0,0,1,.27-1.87l.14-.74.06-.37c.11-.55.19-1,.25-1.45a8.07,8.07,0,0,0,.09-1.16,1.73,1.73,0,0,0-.2-1,.88.88,0,0,0-.73-.27,2.3,2.3,0,0,0-1.38.61,5.7,5.7,0,0,0-1.3,1.46l-.75,5.55h-1.46l1-7.44-.75-.36.13-.59,1.87-.34.32.17-.2,1.85a5.77,5.77,0,0,1,1.5-1.46"/><path class="cls-1" d="M312.92,37.29a4,4,0,0,1-1.55,1.05,5.36,5.36,0,0,1-1.78.32,5.69,5.69,0,0,1-1-.09,3.57,3.57,0,0,1-.77-.19l.33-1.24a5,5,0,0,0,.9.34,3.51,3.51,0,0,0,1.06.17,2.22,2.22,0,0,0,1.45-.39,2.11,2.11,0,0,0,.62-1.41l.3-2a3.73,3.73,0,0,1-1,.84,2.63,2.63,0,0,1-1.33.34,2.16,2.16,0,0,1-1.89-.88,3.9,3.9,0,0,1-.64-2.35,6.35,6.35,0,0,1,.58-2.6A5.62,5.62,0,0,1,309.88,27a4.11,4.11,0,0,1,2.61-.87,4.56,4.56,0,0,1,.87.1,5.15,5.15,0,0,1,.8.24l.95-.34-1.38,9.31a3.37,3.37,0,0,1-.81,1.87m-.62-10.36a2.35,2.35,0,0,0-1.74.74,4.7,4.7,0,0,0-1.07,1.85,7.16,7.16,0,0,0-.35,2.15,3.3,3.3,0,0,0,.37,1.72,1.14,1.14,0,0,0,1,.62,2,2,0,0,0,1.19-.39,3.3,3.3,0,0,0,.91-.87l.82-5.5a1.88,1.88,0,0,0-1.16-.32"/><path class="cls-1" d="M237.11,49.24c.83-1.82,1.39-3.07,1.65-3.76h3.29l-.06.66-1.37.17-.29,9.8,1.31.18-.07.6h-4.22l.06-.6,1.4-.18.35-6.79.2-3.12L238.2,49l-3.57,8-.83.11-1.26-7.89-.47-2.92-.63,3-1.64,6.91,1.55.18-.06.6h-4l.06-.6,1.28-.18,2.47-9.8-1.41-.17.09-.66h3.56L234.56,53l.2,1.57.67-1.53c.28-.69.84-1.95,1.68-3.77"/><path class="cls-1" d="M247.75,56.54a3.75,3.75,0,0,1-1.95.52,3,3,0,0,1-1.71-.47,2.7,2.7,0,0,1-1-1.23,4.19,4.19,0,0,1-.32-1.63,6.35,6.35,0,0,1,.59-2.75,5.17,5.17,0,0,1,1.63-2,3.7,3.7,0,0,1,2.29-.77,2.32,2.32,0,0,1,1.65.52,1.82,1.82,0,0,1,.55,1.37,2.34,2.34,0,0,1-.89,1.84A5.79,5.79,0,0,1,246.5,53a8,8,0,0,1-2.15.4,3.51,3.51,0,0,0,.37,1.87,1.48,1.48,0,0,0,1.4.79,3.18,3.18,0,0,0,1.35-.32,3.75,3.75,0,0,0,1.21-.9l.34.57a4,4,0,0,1-1.27,1.11m-2.11-7a4.25,4.25,0,0,0-.87,1.45,6.25,6.25,0,0,0-.39,1.69,5.44,5.44,0,0,0,1.63-.33,4.05,4.05,0,0,0,1.4-.87A1.76,1.76,0,0,0,248,50.2a1.33,1.33,0,0,0-.29-.92,1,1,0,0,0-.77-.31,1.74,1.74,0,0,0-1.28.57"/><path class="cls-1" d="M257.17,55.72q0,.39.24.39a1.19,1.19,0,0,0,.7-.39l.22.39a3.42,3.42,0,0,1-.67.62,1.68,1.68,0,0,1-1,.31c-.6,0-.9-.32-.9-1v-.34a3.94,3.94,0,0,1-1.08.94,2.72,2.72,0,0,1-1.44.38,2.13,2.13,0,0,1-1.87-.88,4,4,0,0,1-.63-2.34,6.41,6.41,0,0,1,.58-2.62A5.56,5.56,0,0,1,253,49a4.1,4.1,0,0,1,2.61-.86,4,4,0,0,1,1.15.18l.41-2.76-1-.26.13-.54,2.16-.28.34.2-1.6,10.84a.79.79,0,0,0,0,.17M255.42,49a2.32,2.32,0,0,0-1.74.75,4.64,4.64,0,0,0-1.06,1.84,7.15,7.15,0,0,0-.34,2.16,3.44,3.44,0,0,0,.36,1.72,1.12,1.12,0,0,0,1,.61,2.06,2.06,0,0,0,1.23-.41,3.11,3.11,0,0,0,.9-.91l.83-5.42a1.94,1.94,0,0,0-1.2-.34"/><path class="cls-1" d="M262.14,55.72a.57.57,0,0,0,.06.29.24.24,0,0,0,.18.1.71.71,0,0,0,.35-.11,3.84,3.84,0,0,0,.44-.35l.19.37a2.88,2.88,0,0,1-.68.67,1.71,1.71,0,0,1-1.08.35,1.19,1.19,0,0,1-.78-.23.8.8,0,0,1-.22-.72c0-.25.15-1.25.4-3,.14-.93.32-2.16.52-3.7l-.95-.35.09-.52,2.18-.36.34.17-1,7.22Zm-.07-9.46a.81.81,0,0,1-.24-.6,1.12,1.12,0,0,1,.3-.78,1,1,0,0,1,.71-.32.83.83,0,0,1,.62.24.81.81,0,0,1,.23.57,1.2,1.2,0,0,1-.29.81,1,1,0,0,1-.77.33.73.73,0,0,1-.56-.25"/><path class="cls-1" d="M269.42,49.14a2,2,0,0,0-1.35.54,3.6,3.6,0,0,0-.92,1.52,7,7,0,0,0-.33,2.24,3.52,3.52,0,0,0,.43,2,1.39,1.39,0,0,0,1.24.66,2.38,2.38,0,0,0,1.1-.24,5.05,5.05,0,0,0,1-.72l.3.57a4,4,0,0,1-1.14,1A3.43,3.43,0,0,1,268,57a2.44,2.44,0,0,1-2-.91,4,4,0,0,1-.73-2.54,6.43,6.43,0,0,1,.53-2.51A5.3,5.3,0,0,1,267.33,49a3.69,3.69,0,0,1,2.42-.83,5,5,0,0,1,.93.09,3.09,3.09,0,0,1,.81.26L271.07,50l-.26-.09a2.53,2.53,0,0,0-1.39-.78"/><path class="cls-1" d="M274.77,55.72a.56.56,0,0,0,.07.29.24.24,0,0,0,.18.1.71.71,0,0,0,.35-.11,3.15,3.15,0,0,0,.43-.35l.2.37a2.88,2.88,0,0,1-.68.67,1.71,1.71,0,0,1-1.08.35,1.19,1.19,0,0,1-.78-.23.8.8,0,0,1-.22-.72c0-.25.15-1.25.4-3,.14-.93.32-2.16.52-3.7l-1-.35.09-.52,2.18-.36.34.17-1,7.22Zm-.07-9.46a.85.85,0,0,1-.23-.6,1.12,1.12,0,0,1,.3-.78.94.94,0,0,1,.71-.32.79.79,0,0,1,.61.24.78.78,0,0,1,.24.57,1.16,1.16,0,0,1-.3.81,1,1,0,0,1-.76.33.75.75,0,0,1-.57-.25"/><path class="cls-1" d="M282,48.73a3.09,3.09,0,0,1,1.73-.56,1.65,1.65,0,0,1,1.32.52,2.54,2.54,0,0,1,.46,1.7,15.09,15.09,0,0,1-.33,2.35l-.07.36-.12.73a11.6,11.6,0,0,0-.24,1.86c0,.28.06.42.19.42a1.22,1.22,0,0,0,.73-.39l.18.4a1.77,1.77,0,0,1-.32.36,3.21,3.21,0,0,1-.61.39,1.86,1.86,0,0,1-.79.17c-.64,0-1-.31-1-.93a13.42,13.42,0,0,1,.28-1.88l.14-.73.06-.37c.1-.56.18-1,.25-1.45a8.17,8.17,0,0,0,.09-1.16,1.67,1.67,0,0,0-.21-1,.87.87,0,0,0-.73-.27,2.31,2.31,0,0,0-1.37.61,5.58,5.58,0,0,0-1.3,1.47l-.75,5.54H278.2l1-7.43-.75-.37.12-.58,1.87-.34.33.17-.2,1.84A5.85,5.85,0,0,1,282,48.73"/><path class="cls-1" d="M292.42,56.54a3.75,3.75,0,0,1-1.95.52,3,3,0,0,1-1.71-.47,2.7,2.7,0,0,1-1-1.23,4.19,4.19,0,0,1-.32-1.63A6.35,6.35,0,0,1,288,51a5.17,5.17,0,0,1,1.63-2,3.7,3.7,0,0,1,2.29-.77,2.32,2.32,0,0,1,1.65.52,1.82,1.82,0,0,1,.55,1.37,2.34,2.34,0,0,1-.89,1.84A5.79,5.79,0,0,1,291.17,53a8,8,0,0,1-2.15.4,3.51,3.51,0,0,0,.37,1.87,1.48,1.48,0,0,0,1.4.79,3.18,3.18,0,0,0,1.35-.32,3.75,3.75,0,0,0,1.21-.9l.34.57a4,4,0,0,1-1.27,1.11m-2.11-7a4.25,4.25,0,0,0-.87,1.45,6.25,6.25,0,0,0-.39,1.69,5.44,5.44,0,0,0,1.63-.33,4.05,4.05,0,0,0,1.4-.87,1.76,1.76,0,0,0,.57-1.28,1.33,1.33,0,0,0-.29-.92,1,1,0,0,0-.77-.31,1.74,1.74,0,0,0-1.28.57"/></g></g></svg> </a> </div> <div><a href="http://www.nasonline.org/" rel="noreferrer" target="_blank" class="global-footer__org"><img src="data:image/png;base64,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" alt="NAS Logo" width="17" height="17"> <span> National Academy of Sciences </span></a> <a href="https://www.nae.edu/" rel="noreferrer" target="_blank" class="global-footer__org"><img src="data:image/png;base64,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" alt="NAE Logo" width="17" height="17"> <span> National Academy of Engineering </span></a> <a href="https://nam.edu/" rel="noreferrer" target="_blank" class="global-footer__org"><img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAC4AAAAuCAYAAABXuSs3AAAACXBIWXMAABYlAAAWJQFJUiTwAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAiySURBVHgBrVl5bFRFGP/eUmppjd0GWs+yD1GpVOy2CWCkSV8xAvHq4oFY0S71iqhQxeg/2sPEoP3DtlIPiPZQolESbaPEqNguKh6gsBUqNKjdVuUqR6vQgNA+5zdv3/Ydsyf9JS+znTcz7zfffNd8lWg84PU46SwpJJFMDnIROWQi1am9lAZJHe0ilVhLftrQ5qNxgBTX6FKPe2F+gbJgltuVdl4KJ7a5u0tmjzI4fDKelXw0qrbSBGqjlrZBSgDRiS/zKBU33Voy46JLvUtmX+90pqYJh23p6abWbzupdauP4gAjLbWRNFrDNhCIZ2JY4sqa55QVxYuqbsi9VglHVoTWrZ301PvNNDg8THFBlarJMdoQ6wnYiXs98qPzFzU/vbBEkadkUSLo6g/Q/NrK+MkTBUhSi2ORvsPWc5bkxnsfSpg0kDdVpqbyxykByEzyvXSfpyLaQDvxJPLvCPyRkMEYUVIwh4pm5EYdBwHZhOSQ6uj+26sizZtg6/HvPbXjguSe5OSkpe6p0yhWwKukTEy2kRIZK9ZdOreQFs3KJyXnGt6WFMzlv0+f+Y8CRwagxArlzWR6t2eL6Hti4yxbvBPry1MyKS97GhXlzCTX5AvJmZrKX/cdHWCLH6Y+9vh6fuUtUFmyhFbdeEtoHDCh/E7T0hULbuFzV7EWREUCwFPT9gG1MC/F3OaT9G5bfXTiOCJJraYEUFao0CtLy03EL39mRWhj3sJi3taVYkx0T1XNyGMDQYP1Gd+ZdZz57ERJQy1ck7NMpCE5nTTe4+8qz90Uq3utZmPrSpfDVTbz6ByW+AQ2IEHcP08hqJYRCEo6lJxcbrDxequKBbdis8zbOEzGmhT6dZ/HS3BHCUCXZtm8Jab+hi828RYSxuMtnG+bCz1u/baDGyQ23vzgE7bNQfJDwycr6iUeoALoG5O4Q4rofiKRvi1/NjPKm039bTu2hSTuZn5dlMtAf5e/tZZ8e7u5waLNr1zN5v5oGw8Vu8w5OeTfNXcIaUuSlxIgXTRjJndn102/KtQPEqXr6piUtMgJ74GxRi/i27ubkW60rXnqzBn68fd9dHF6BhndMVzt2ZGRnM3Jp9fBZWsSd0hllCDpIuhu/hzTO+QqffDFQUB61uNHQhYO2DikjhMw4uHiBc4rplzs5ZSRm7BWoQRJl80rNr2raf+Q2nduN/VBv10W4n6Wz0QCNruFnYp1nacW3VaiET9LboqTNHS6jPlkEekX2BMLjkfJ3yFtkA8E3amOOdOvdMM1JjHqCsVJGoEkL1s2vWv48tOIpCE9PdpCckPDJygaML6dGTmirI7pWRfBn7uTmFHmUQyIRFrLwVtsc2BcukdRSTt+XWWqPUu51LUNDdgkC2CD/v5eW9/C3AJGnFQ52kUoEmkcafnbr5kW9rBAA6L5jHh68O9w0dLfrwWl+i8+ZX7/E1MOL1IVYGFunsyIS06KgnCku/4M0B2NL4f+xhiQSGdhH8EmltCuuzwEGcwvfqkyRBbE0wVrjEijMtxhROIrWWDJYJOtpLH44rUvcwmBbEVQD2G0CNPxXPd0YJ2PVz5ryncCBreq4+Sp0+lJkRZCSgsCSFeNgCTm11ZxXw2JIQ+B7tYZjMgIBBvfnt18Leg1iDlTz2d20cTIXsjnwwBBHOth48gMgXACAHHcdoRSd091MZen2PrL327kpKG7AKQsunQ0ML0FAS2PYSnvPeaUF54IxocHOg51QWhHfNAhcWsxIy3lvCGmKqrwmoZrl0twrdIDDPQRhJBbW0mDCHKOiveaQjkHdNVqaNZsEpuEsevfRCuS+P5jxwPQcT8JgAuvVdr4MHw1iIKQKJODlEHa6sb6jh5mxmzuS59kJ4VM0ZhgiU6S5SyMuEpdJAAM0koKpCEB+GZRbo1sD1IWQSQ5UW6uBakxg4QArVjbscnvYJHTZ32Rx3Z5bbZ9QvvObSG9tubWIK0blAiBAZAxxwujvo/1pXFjRgvJW++lPi1/8euqYtJz56RU20ege/AEAAwoHtLhoK9nBIgil9cEJNlOZc/ff/lQ7XLwkpfKCpAGyJmZlJFmlgb0Uzcm42I42kRIh4OLfUM34pKC2bb3nT27ONdgPs6qplGgB5oygYrEAggjfVJqxDHw50iq0IK8VR2hJhu3f+cbI65d/X36AH9/HzsE8eJug7FAB1siXAiMwNiMtDRLnzlDRDzAevAkZYXFtjX2HTzQYr9zSmqN/hOpp9XHQtqBYEqqw+ryIoEXliwlOWs4x1UOug11sUob33649fUQxzHiBqlr9RDzoqI64FCM1VhsVhHM77LcgvQ6oqga8MyHrQ3GKq65riKpyynoYXw93ZZFM22JVqzAPJflBPnVzPANjXAxz1msPv+9778OMN2uNvaZiWNHEqvVMbz65SZbfRuXYqMxGnOKSGh64DGbW0NMMJKu8iwJJVpGQEXuXV+32FrwF1Vr/ZSfI7EygZIycSK3cOMHuphef77bz/0tSgawh0gXX9Rb7maVWStub6zlqgadXnPXMtbOtVV7QXrFO+ue/K32jahebwxeT7Xz0WXq74cOqCMjI6ano/sXteqj99XegUPq8ZMnVHn1Iyqr8NqeVRvess3F0/T1ZlVZ87zauWeXGg5YW3nxuepw9KRo5Iuuuqaq49ka4WvcNaFOElulnpXbhnCnnJzJVUh0Y9Kl2H/siLDEbBwDSX+2urKeEobXU7EyjOTifXB6zd98pUbCxm1bj+MfZzQuYEWj0jfrekVqEw/pj3/+ISxhqNxj76zvDBaoxhd3vVrr3eT/uTcewkf//Uft+HWXurPvj7CEN277rnP8pBxlA09sWN/7FTNSEBORxbuPfvohLGEY5rkQju9f4lZ4PW4aJe/Vl2TnZV2QrkzLhGHO4vmM9doFg/vt0MHBfQf3+z/p2t7+2a4dbfH+N3n8iFuh6ac885JsOSstA79pUkrSICMZIOT950DUiv8BEppcI32BQ8oAAAAASUVORK5CYII=" alt="NAM Logo" width="17" height="17"> <span> National Academy of Medicine </span></a></div></div> <div class="global-footer__links"><ul class="global-footer__nav"><li><a rel="" title="" href="//www.nationalacademies.org/about" target="_self"> About Us </a></li><li><a rel="" title="" href="//www.nationalacademies.org/our-work" target="_self"> Our Work </a></li><li><a rel="" title="" href="//www.nationalacademies.org/events" target="_self"> Events </a></li><li><a rel="" title="" href="//www.nationalacademies.org/contact-us" target="_self"> Contact Us </a></li><li><a rel="" title="" href="//www.nationalacademies.org/opportunities" target="_self"> Opportunities </a></li><li><a rel="" title="" href="//www.nationalacademies.org/publications" target="_self"> Publications </a></li><li><a rel="" title="" href="//www.nationalacademies.org/about/visiting-us" target="_self"> Visit </a></li><li><a rel="" title="" href="//www.nationalacademies.org/about/operating-status" target="_self"> Current Operating Status </a></li><li><a rel="" title="" href="//www.nationalacademies.org/subscribe" target="_self"> E-Newsletters </a></li></ul> <div class="global-footer__social"><p> Connect With Us </p> <ul><li><a href="https://www.facebook.com/NationalAcademies/" target="_self" class="connect-facebook"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 30 30" class=""><path fill-rule="evenodd" d="M20 9.375h-2.222c-.334 0-1.111.531-1.111 1.125v2.25H20v3.375h-3.333V24h-3.334v-7.875H10V12.75h3.333V10.5c0-2.482 2.18-4.5 4.515-4.5H20v3.375"></path></svg></a></li><li><a href="https://twitter.com/TheNASEM" target="_self" class="connect-twitter"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 30 30" class=""><path fill-rule="evenodd" d="M24 9.775a7.238 7.238 0 01-2.121.598 3.787 3.787 0 001.625-2.096 7.253 7.253 0 01-2.347.92A3.65 3.65 0 0018.461 8c-2.04 0-3.695 1.697-3.695 3.787 0 .298.033.586.096.863-3.07-.157-5.793-1.665-7.615-3.956a3.853 3.853 0 00-.499 1.904c0 1.313.853 2.472 1.845 3.151-.606-.02-1.473-.191-1.473-.475v.05c0 1.833 1.072 3.363 2.761 3.712-.31.086-.736.133-1.072.133a3.99 3.99 0 01-.746-.07c.47 1.505 1.81 2.6 3.425 2.632A7.343 7.343 0 016 21.299 10.277 10.277 0 0011.66 23c6.795 0 10.51-5.77 10.51-10.774 0-.163-.005-.328-.013-.491A7.588 7.588 0 0024 9.775"></path></svg></a></li><li><a href="https://www.linkedin.com/company/the-national-academies" target="_self" class="connect-linkedin"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 30 30" class=""><path fill-rule="evenodd" d="M7 23V10.533h3.4V23H7zm12.467-12.467c2.558 0 4.533 2.034 4.533 5.665V23h-3.4v-6.347c0-1.586-.779-2.679-2.192-2.679-1.082 0-1.94.736-2.223 1.443-.097.251-.118.608-.118.959V23h-3.4s.088-11.333.035-12.467h3.365l-.04 2.267c.516-1.133 1.335-2.267 3.44-2.267zM10.4 7.7a1.7 1.7 0 11-3.4 0 1.7 1.7 0 013.4 0z"></path></svg></a></li><li><a href="http://www.nationalacademies.org/news.xml" target="_self" title="Share our site" class="connect-rss"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 30 30" class=""><path d="M11.85 20.537a2.425 2.425 0 11-4.85 0 2.425 2.425 0 014.85 0zm6.65 1.79c-.316-5.854-5.005-10.548-10.864-10.865a.605.605 0 00-.636.605v1.82c0 .32.246.586.564.607a8.484 8.484 0 017.904 7.904c.02.318.288.564.607.564h1.82c.346 0 .624-.29.605-.636zm5.462.01C23.644 13.484 16.52 6.32 7.625 6A.605.605 0 007 6.606v1.82c0 .327.259.593.585.606 7.238.297 13.048 6.108 13.345 13.345.013.326.28.585.606.585h1.82a.605.605 0 00.606-.625z"></path></svg></a></li><li><a href="//www.nationalacademies.org/subscribe" target="_self" title="Subscribe" class="connect-email"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 30 30" class=""><path fill-rule="evenodd" d="M6 12.964v4.569c0 .296.197.386.439.2l2.822-2.15c.243-.184.243-.484 0-.669l-2.822-2.15c-.242-.185-.439-.095-.439.2zM7.125 9C6.506 9 6 9.601 6 10.071l8.514 6.455a.775.775 0 00.882.002L24 10.07C24 9.601 23.494 9 22.875 9H7.125zm13.613 6.584l2.822 2.15c.243.185.44.095.44-.201v-4.569c0-.295-.197-.385-.44-.2l-2.822 2.15c-.242.185-.242.485 0 .67zM18.26 16.8l-2.822 2.15a.764.764 0 01-.879 0l-2.822-2.15a.765.765 0 00-.88-.001L6 20.495v.29c0 .471.506 1.072 1.125 1.072h15.75c.619 0 1.125-.6 1.125-1.071v-.29L19.141 16.8a.767.767 0 00-.88.001z"></path></svg></a></li></ul></div> <div class="global-footer__legal"><div><button class="button button--icon button--reverse button--secondary"> <a href="https://www8.nationalacademies.org/AcademyGiving/nas/nasform.aspx ">Donate Today</a> <span class="button__icon"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 30 30" class=""><path d="M17.885 10.708a1 1 0 111.412-1.416l5.624 5.608-5.616 5.732a1 1 0 11-1.428-1.4l4.228-4.316-4.22-4.208z"></path><path d="M23.07 14a1 1 0 010 2H7a1 1 0 010-2h16.07z"></path></svg></span></button></div> <div><ul><li><a rel="" title="" href="//www.nationalacademies.org/legal/privacy" target="_self"> Privacy Statement </a></li><li><a rel="" title="" href="//www.nationalacademies.org/legal/policy" target="_self"> DMCA Policy </a></li><li><a rel="" title="" href="//www.nationalacademies.org/legal/terms" target="_self"> Terms of Use </a></li><li><a rel="" title="" href="//www.nationalacademies.org/site-map" target="_self"> Site Map </a></li></ul> <p class="copyright"><a rel="" title="" href="//www.nationalacademies.org/legal" target="_self"> Copyright © <script type="text/javascript"> <!-- var d = new Date(); var n = d.getFullYear(); document.write(n) //--> </script> National Academy of Sciences. All Rights Reserved. </a></p></div></div></div></div></footer> <script src="//nap.nationalacademies.org/includes/js/jquery.dlmenu.js"></script> <script src="//nap.nationalacademies.org/includes/js/jquery.placeholder.js"></script> <!--[if lt IE 9]> <script src="https://oss.maxcdn.com/libs/respond.js/1.4.2/respond.min.js"></script> <![endif]--> <script> // Save to MyNAP handler $('a.saveit').one('click', function(e) { e.preventDefault(); $.getJSON('/napsave.php', { type: 'shelf', r: $(this).data('recordid') }, function(response) { $(e.target) .toggleClass('saveit saveit_active') .attr('href', '/mynap.php') .text('Added to Bookshelf'); }); }); </script> <!-- OneTrust Cookies Consent Notice start for nap.nationalacademies.org --> <script src="https://cdn.cookielaw.org/scripttemplates/otSDKStub.js" type="text/javascript" charset="UTF-8" data-domain-script="5639f7b9-d1de-4e1d-9f2f-e86c3f24727b" ></script> <script type="text/javascript"> function OptanonWrapper() { } </script> <!-- OneTrust Cookies Consent Notice end for nap.nationalacademies.org --> <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.0/umd/popper.min.js"></script> <script src="/vendor/bootstrap/3.1.1/bootstrap.min.js"></script> <script src="//code.highcharts.com/highcharts.js"></script> <script src="//code.highcharts.com/maps/modules/map.js"></script> <script src="//code.highcharts.com/mapdata/custom/world.js"></script> <script> $('#related-books-rows').on('click', '.book-row a', function(e) { var rowTitle = $(this).closest('.book-row').data('title'); var position = ($(this).closest('.book-tile').index()).toString(); var element = $(this).data('alias'); var title = $(this).data('title'); dlPush(rowTitle, position, element, title); }); function dlPush(rowTitle, position, element, title, event){ window.dataLayer = window.dataLayer || [];dataLayer.push({ 'rowTitle' : rowTitle, 'position' : position, 'element' : element, 'title' : title, 'rowpage' : 'catalog', 'event' : 'rowSelect', }); } function dlEvent(element, title, event){ window.dataLayer = window.dataLayer || [];dataLayer.push({ 'element' : element, 'title' : title, 'rowpage' : 'catalog', 'event' : 'cover', }); } $('.merchpurch select').on('change', function() { $(this).siblings('button').prop('disabled', $(this).val() == ''); }); $('#related-books-rows').load('rows', function() { $('.truncate').dotdotdot({ watch: true, lastCharacter: { remove: [' ', ',', ';', '.', '!', '?'] } }); }); if ( $('.book-description').children().length > 1 ) { $('.book-description').children(':gt(0)').hide(); $('.book-description').children(':first').after('<a href="#" class="readmore">[read full description]</a>'); $('.book-description a.readmore').on('click', function(e) { e.preventDefault(); $('.book-description').children(':gt(0)').fadeIn(); $('.book-description a.readmore').remove(); }); } $('.status-popover, [data-content]').popover({ trigger: 'hover', container: 'body' }); let indicatorPosition = $('#stats').offset().top/2; var myFunction = function(){ $('#stats').load('/catalog/27215/stats'); } let check = 1 $(window).scroll(function(){ var totalScroll = $(window).scrollTop(); if (totalScroll > indicatorPosition) { if(check === 1){ myFunction(); check++ } } }); //tooltip $("[data-toggle=tooltip").tooltip(); // console.log("stats loader"); //$('#stats').load('/catalog/27215/stats'); // Save to MyNAP handler $('a.action-add').one('click', function(e) { e.preventDefault(); $.getJSON('/napsave.php', { type: 'shelf', r: $(this).data('recordid') }, function(response) { $(e.target) .toggleClass('action-add action-add-active') .attr('href', '/mynap') .text('Added to Bookshelf'); }); }); // $('.cover-block').on('click', function() { // trackEvent('catalog', 'cover', 'show'); // }); </script> <script> Share = { facebook: function(purl, ptitle, pimg, text) { url = 'https://www.facebook.com/sharer.php?s=100'; url += '&p[title]=' + encodeURIComponent(ptitle); url += '&p[summary]=' + encodeURIComponent(text); url += '&p[url]=' + encodeURIComponent(purl); url += '&p[images][0]=' + encodeURIComponent(pimg); Share.popup(url); }, twitter: function(purl, ptitle) { url = 'https://twitter.com/share?'; url += 'text=' + encodeURIComponent(ptitle); url += '&url=' + encodeURIComponent(purl); url += '&counturl=' + encodeURIComponent(purl); Share.popup(url); }, linkedin: function(purl, ptitle) { url = 'https://www.linkedin.com/share?'; url += 'text=' + encodeURIComponent(ptitle); url += '&url=' + encodeURIComponent(purl); url += '&counturl=' + encodeURIComponent(purl); Share.popup(url); }, popup: function(url) { window.open(url,'','toolbar=0,status=0,width=626, height=436'); } }; </script> <script> var acc = document.getElementsByClassName("cp-accordion"); var i; for (i = 0; i < acc.length; i++) { acc[i].addEventListener("click", function() { this.classList.toggle("active"); var panel = this.nextElementSibling; if (panel.style.maxHeight) { panel.style.maxHeight = null; } else { panel.style.maxHeight = panel.scrollHeight + "px"; } }); } </script> <!-- 144.171.19.9 --> </body> </html>