Weights & Measures

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hide-sub-when-collapse="0"> <a class="we-mega-menu-li" title="" href="/us/government" target=""> Government </a> </li><li class="we-mega-menu-li" data-level="2" data-element-type="we-mega-menu-li" data-id="23258840-bc85-4fb0-bb88-ce0239aa0e1f" data-submenu="0" hide-sub-when-collapse="0"> <a class="we-mega-menu-li" title="" href="/current-events" target=""> News </a> </li><li class="we-mega-menu-li" data-level="2" data-element-type="we-mega-menu-li" data-id="faecca9a-42a4-49c4-a466-504b1b1d757a" data-submenu="0" hide-sub-when-collapse="0"> <a class="we-mega-menu-li" title="" href="/us/military" target=""> Military </a> </li><li class="we-mega-menu-li" data-level="2" data-element-type="we-mega-menu-li" data-id="b7a741f7-ccd0-45db-9d5d-e0311755e640" data-submenu="0" hide-sub-when-collapse="0"> <a class="we-mega-menu-li" title="" href="/history-and-government/us-historical-monuments" target=""> Monuments & Landmarks </a> </li><li class="we-mega-menu-li" data-level="2" 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Statistics </a> </li><li class="we-mega-menu-li" data-level="2" data-element-type="we-mega-menu-li" data-id="78a597de-29f1-4bc8-b0a7-6ed1c8e90bf2" data-submenu="0" hide-sub-when-collapse="0"> <a class="we-mega-menu-li" title="" href="/culture-entertainment" target=""> Arts & Entertainment </a> </li><li class="we-mega-menu-li" data-level="2" data-element-type="we-mega-menu-li" data-id="859fbbf0-ed65-484c-87d9-1ef9013fdeb0" data-submenu="0" hide-sub-when-collapse="0"> <a class="we-mega-menu-li" title="" href="/culture-entertainment/sports" target=""> Sports </a> </li> </ul> </div> </div> </div> </div> </li><li class="we-mega-menu-li dropdown-menu we-mega-menu-group" data-level="1" data-element-type="we-mega-menu-li" data-id="e1bc4f50-e073-4d69-b307-abd57db40de1" data-submenu="1" hide-sub-when-collapse="0" data-group="1"> <span data-drupal-link-system-path="<front>" class="we-megamenu-nolink">History<i class="arrow down"></i></span> <div class="we-mega-menu-submenu" 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hide-sub-when-collapse="0"> <a class="we-mega-menu-li" title="" href="/history/world" target=""> World History </a> </li><li class="we-mega-menu-li" data-level="2" data-element-type="we-mega-menu-li" data-id="7e9ce0c4-b34d-4021-a9a1-51b6f26f2a3f" data-submenu="0" hide-sub-when-collapse="0"> <a class="we-mega-menu-li" title="" href="/history/us" target=""> U.S. History </a> </li><li class="we-mega-menu-li" data-level="2" data-element-type="we-mega-menu-li" data-id="4ad2a1d4-8110-45ff-864f-61a7e677915c" data-submenu="0" hide-sub-when-collapse="0"> <a class="we-mega-menu-li" title="" href="/history/black-history" target=""> Black History Month </a> </li><li class="we-mega-menu-li" data-level="2" data-element-type="we-mega-menu-li" data-id="dbbab138-8121-4d5a-a022-8a8af6ff3073" data-submenu="0" hide-sub-when-collapse="0"> <a class="we-mega-menu-li" title="" href="/history/hispanic-heritage" target=""> Hispanic Heritage Month </a> </li><li class="we-mega-menu-li" data-level="2" data-element-type="we-mega-menu-li" data-id="9646478f-f2ce-49e5-b90d-a26bc85f39d1" data-submenu="0" hide-sub-when-collapse="0"> <a class="we-mega-menu-li" title="" href="/history/womens-history" target=""> Women's History Month </a> </li> </ul> </div> </div> </div> </div> </li> </ul> </div> <div class="we-mega-menu-col span3" data-element-type="we-mega-menu-col" data-width="3" data-blocktitle="1" data-hidewhencollapse="0"> <ul class="nav nav-tabs subul"> <li class="we-mega-menu-li dropdown-menu we-mega-menu-group active active-trail" data-level="1" data-element-type="we-mega-menu-li" data-id="823c9906-9f40-4c10-8bb9-57da2519a641" data-submenu="1" hide-sub-when-collapse="0" data-group="1"> <span data-drupal-link-system-path="<front>" class="we-megamenu-nolink">Math & Science<i class="arrow down"></i></span> <div class="we-mega-menu-submenu" data-element-type="we-mega-menu-submenu"> <div class="we-mega-menu-submenu-inner"> <div class="we-mega-menu-row" 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hide-sub-when-collapse="0"> <a class="we-mega-menu-li" title="" href="/math-science/inventions-discoveries" target=""> Inventions & Discoveries </a> </li><li class="we-mega-menu-li" data-level="2" data-element-type="we-mega-menu-li" data-id="1616d2b9-7d57-4980-9559-5bdc425e5e61" data-submenu="0" hide-sub-when-collapse="0"> <a class="we-mega-menu-li" title="" href="/math-science/mathematics" target=""> Mathematics </a> </li><li class="we-mega-menu-li" data-level="2" data-element-type="we-mega-menu-li" data-id="f306cda5-cdc9-476e-9d51-4e64af61e583" data-submenu="0" hide-sub-when-collapse="0"> <a class="we-mega-menu-li" title="" href="/math-science/physics" target=""> Physics </a> </li><li class="we-mega-menu-li" data-level="2" data-element-type="we-mega-menu-li" data-id="37a433fe-ab89-4d18-b369-3ea72e8ad9fc" data-submenu="0" hide-sub-when-collapse="0"> <a class="we-mega-menu-li" title="" href="/math-science/space" target=""> Space </a> </li><li class="we-mega-menu-li" data-level="2" 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class="we-mega-menu-submenu-inner"> <div class="we-mega-menu-row" data-element-type="we-mega-menu-row" data-custom-row="0"> <div class="we-mega-menu-col span12" data-element-type="we-mega-menu-col" data-width="12" data-hidewhencollapse="0"> <ul class="nav nav-tabs subul"> <li class="we-mega-menu-li" data-level="2" data-element-type="we-mega-menu-li" data-id="7ebfbf4a-de2b-460b-930f-1928372833d7" data-submenu="0" hide-sub-when-collapse="0"> <a class="we-mega-menu-li" title="" href="/calendars" target=""> Calendar & Holidays Overview </a> </li><li class="we-mega-menu-li" data-level="2" data-element-type="we-mega-menu-li" data-id="4411d1bf-0883-4267-8759-11614e0f285f" data-submenu="0" hide-sub-when-collapse="0"> <a class="we-mega-menu-li" title="" href="/calendars/history" target=""> Calendars </a> </li><li class="we-mega-menu-li" data-level="2" data-element-type="we-mega-menu-li" data-id="d76efcb5-a742-4b6a-b14d-217d6d76e9ca" data-submenu="0" hide-sub-when-collapse="0"> <a class="we-mega-menu-li" title="" href="/culture-entertainment/holidays" target=""> Holidays </a> </li><li class="we-mega-menu-li" data-level="2" data-element-type="we-mega-menu-li" data-id="56cc31b3-222b-448a-bf5c-bd325334323d" data-submenu="0" hide-sub-when-collapse="0"> <a class="we-mega-menu-li" title="" href="/calendars/months-seasons" target=""> Seasons, Months, Days </a> </li><li class="we-mega-menu-li" data-level="2" data-element-type="we-mega-menu-li" data-id="fe1989d7-ce71-4b13-9848-4f86e931467e" data-submenu="0" hide-sub-when-collapse="0"> <a class="we-mega-menu-li" title="" href="/calendar" target=""> Perpetual Calendar </a> </li> </ul> </div> </div> </div> </div> </li> </ul> </div> <div class="we-mega-menu-col span3" data-element-type="we-mega-menu-col" data-width="3" data-blocktitle="1" data-hidewhencollapse="0"> <ul class="nav nav-tabs subul"> <li class="we-mega-menu-li dropdown-menu we-mega-menu-group" data-level="1" data-element-type="we-mega-menu-li" data-id="460bd358-e183-4af6-a30d-8c241e4f3651" data-submenu="1" hide-sub-when-collapse="0" data-group="1"> <span data-drupal-link-system-path="<front>" class="we-megamenu-nolink">Business<i class="arrow down"></i></span> <div class="we-mega-menu-submenu" data-element-type="we-mega-menu-submenu"> <div class="we-mega-menu-submenu-inner"> <div class="we-mega-menu-row" data-element-type="we-mega-menu-row" data-custom-row="0"> <div class="we-mega-menu-col span12" data-element-type="we-mega-menu-col" data-width="12" data-hidewhencollapse="0"> <ul class="nav nav-tabs subul"> <li class="we-mega-menu-li" data-level="2" data-element-type="we-mega-menu-li" data-id="b1311617-2ec4-4bde-804a-719134a89765" data-submenu="0" hide-sub-when-collapse="0"> <a class="we-mega-menu-li" title="" href="/business-and-finance" target=""> Business Overview </a> </li><li class="we-mega-menu-li" data-level="2" data-element-type="we-mega-menu-li" description="Business" data-id="9513d3b1-064f-4a95-9e98-a0c9ed4302f3" 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href="/business/economy" target=""> Economy </a> </li><li class="we-mega-menu-li" data-level="2" data-element-type="we-mega-menu-li" data-id="d71a21f6-4513-4b0b-85e3-7536e3c8abb1" data-submenu="0" hide-sub-when-collapse="0"> <a class="we-mega-menu-li" title="" href="/business/labor" target=""> Employment & Labor </a> </li><li class="we-mega-menu-li" data-level="2" data-element-type="we-mega-menu-li" description="Personal Finance" data-id="96f6fbb9-2438-42e8-b2a9-28d2fb98fc3d" data-submenu="0" hide-sub-when-collapse="0"> <a class="we-mega-menu-li" title="Personal Finance" href="/business/consumer-resources/personal-finance" target=""> Personal Finance </a> </li><li class="we-mega-menu-li" data-level="2" data-element-type="we-mega-menu-li" description="Poverty & Income" data-id="a4bbd341-91b6-4f5a-9c15-fcb11d0264c4" data-submenu="0" hide-sub-when-collapse="0"> <a class="we-mega-menu-li" title="Poverty &amp; Income" href="/business/poverty-income" target=""> Poverty & Income </a> </li><li 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