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style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2000/">2000</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2001/">2001</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2002/">2002</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2003/">2003</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2004/">2004</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2005/">2005</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2006/">2006</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2007/">2007</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2008/">2008</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" 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style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2019/">2019</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2020/">2020</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2021/">2021</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2022/">2022</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2023/">2023</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2024/">2024</a><a class="date-selector" style="cursor:pointer;border:none;color:var(--color-black);border-radius:0.5rem;padding:0.25rem 0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/2025/">2025</a></div></div></div><div class="issue__list-8JHD2"><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1999/12-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/3ACFDEDF-F79B-444B-A54E5F9F135C6B22_source.jpg?w=600" alt="Scientific American Magazine Vol 281 Issue 6" srcSet="https://static.scientificamerican.com/sciam/cache/file/3ACFDEDF-F79B-444B-A54E5F9F135C6B22_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/3ACFDEDF-F79B-444B-A54E5F9F135C6B22_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1999-12-01">December 1999</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1999/11-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/EFF9CF43-75E6-4E42-A8F1D58F9B4515F7_source.jpg?w=600" alt="Scientific American Magazine Vol 281 Issue 5" srcSet="https://static.scientificamerican.com/sciam/cache/file/EFF9CF43-75E6-4E42-A8F1D58F9B4515F7_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/EFF9CF43-75E6-4E42-A8F1D58F9B4515F7_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1999-11-01">November 1999</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1999/10-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/4A742B11-C99D-4CB8-BB3D883A1C4FEAB4_source.jpg?w=600" alt="Scientific American Magazine Vol 281 Issue 4" srcSet="https://static.scientificamerican.com/sciam/cache/file/4A742B11-C99D-4CB8-BB3D883A1C4FEAB4_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/4A742B11-C99D-4CB8-BB3D883A1C4FEAB4_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1999-10-01">October 1999</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1999/09-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/0CC7DCDB-5AF7-4C47-9F05505BF9B27576_source.jpg?w=600" alt="Scientific American Magazine Vol 281 Issue 3" srcSet="https://static.scientificamerican.com/sciam/cache/file/0CC7DCDB-5AF7-4C47-9F05505BF9B27576_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/0CC7DCDB-5AF7-4C47-9F05505BF9B27576_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1999-09-01">September 1999</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1999/08-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/82196645-73AB-42E1-BF4F91B4BB4883D5_source.jpg?w=600" alt="Scientific American Magazine Vol 281 Issue 2" srcSet="https://static.scientificamerican.com/sciam/cache/file/82196645-73AB-42E1-BF4F91B4BB4883D5_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/82196645-73AB-42E1-BF4F91B4BB4883D5_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1999-08-01">August 1999</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1999/07-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/B6449567-3984-4FB7-ABC7FC04AB84CCAF_source.jpg?w=600" alt="Scientific American Magazine Vol 281 Issue 1" srcSet="https://static.scientificamerican.com/sciam/cache/file/B6449567-3984-4FB7-ABC7FC04AB84CCAF_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/B6449567-3984-4FB7-ABC7FC04AB84CCAF_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1999-07-01">July 1999</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1999/06-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/EFE24156-7B2D-4ED3-B1B9312EB9783DCB_source.jpg?w=600" alt="Scientific American Magazine Vol 280 Issue 6" srcSet="https://static.scientificamerican.com/sciam/cache/file/EFE24156-7B2D-4ED3-B1B9312EB9783DCB_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/EFE24156-7B2D-4ED3-B1B9312EB9783DCB_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1999-06-01">June 1999</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1999/05-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/0B1E3B81-CCC4-4A8D-B438264606C08F13_source.jpg?w=600" alt="Scientific American Magazine Vol 280 Issue 5" srcSet="https://static.scientificamerican.com/sciam/cache/file/0B1E3B81-CCC4-4A8D-B438264606C08F13_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/0B1E3B81-CCC4-4A8D-B438264606C08F13_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1999-05-01">May 1999</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1999/04-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/57D0D2C9-F3C1-4696-A50F94AB25C4DFC7_source.jpg?w=600" alt="Scientific American Magazine Vol 280 Issue 4" srcSet="https://static.scientificamerican.com/sciam/cache/file/57D0D2C9-F3C1-4696-A50F94AB25C4DFC7_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/57D0D2C9-F3C1-4696-A50F94AB25C4DFC7_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1999-04-01">April 1999</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1999/03-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/1990C8E8-EDB9-4B1B-8390F102116008EF_source.jpg?w=600" alt="Scientific American Magazine Vol 280 Issue 3" srcSet="https://static.scientificamerican.com/sciam/cache/file/1990C8E8-EDB9-4B1B-8390F102116008EF_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/1990C8E8-EDB9-4B1B-8390F102116008EF_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1999-03-01">March 1999</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1999/02-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/DB6824F9-256B-45F8-9583F1B2DC2ABDB2_source.gif?w=600" alt="Scientific American Magazine Vol 280 Issue 1" srcSet="https://static.scientificamerican.com/sciam/cache/file/DB6824F9-256B-45F8-9583F1B2DC2ABDB2_source.gif?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/DB6824F9-256B-45F8-9583F1B2DC2ABDB2_source.gif?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1999-02-01">February 1999</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1999/01-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/30C6248B-D0D4-4EC5-AC63101A174D1F6B_source.jpg?w=600" alt="Scientific American Magazine Vol 280 Issue 1" srcSet="https://static.scientificamerican.com/sciam/cache/file/30C6248B-D0D4-4EC5-AC63101A174D1F6B_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/30C6248B-D0D4-4EC5-AC63101A174D1F6B_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1999-01-01">January 1999</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1998/12-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/7B9BFA23-955E-41A5-A9CEFF0946F42F50_source.jpg?w=600" alt="Scientific American Magazine Vol 279 Issue 6" srcSet="https://static.scientificamerican.com/sciam/cache/file/7B9BFA23-955E-41A5-A9CEFF0946F42F50_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/7B9BFA23-955E-41A5-A9CEFF0946F42F50_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1998-12-01">December 1998</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1998/11-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/6219EC28-0A77-47B7-9B830FEE43B181A3_source.jpg?w=600" alt="Scientific American Magazine Vol 279 Issue 5" srcSet="https://static.scientificamerican.com/sciam/cache/file/6219EC28-0A77-47B7-9B830FEE43B181A3_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/6219EC28-0A77-47B7-9B830FEE43B181A3_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1998-11-01">November 1998</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1998/10-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/2ADF0277-2FDE-4D3D-8784167C7F68C6AB_source.jpg?w=600" alt="Scientific American Magazine Vol 279 Issue 4" srcSet="https://static.scientificamerican.com/sciam/cache/file/2ADF0277-2FDE-4D3D-8784167C7F68C6AB_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/2ADF0277-2FDE-4D3D-8784167C7F68C6AB_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1998-10-01">October 1998</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1998/09-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/E663ECCC-3F61-4421-831A5DAB0E77A567_source.jpg?w=600" alt="Scientific American 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https://static.scientificamerican.com/sciam/cache/file/811B0B29-E578-4DBD-994AAC9478373985_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1998-07-01">July 1998</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1998/06-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/88210CD4-6308-4056-A590BB33D3789545_source.jpg?w=600" alt="Scientific American Magazine Vol 278 Issue 6" srcSet="https://static.scientificamerican.com/sciam/cache/file/88210CD4-6308-4056-A590BB33D3789545_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/88210CD4-6308-4056-A590BB33D3789545_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1998-06-01">June 1998</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1998/05-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/D1B344A6-E801-43A0-B789552612B42988_source.jpg?w=600" alt="Scientific American Magazine Vol 278 Issue 5" srcSet="https://static.scientificamerican.com/sciam/cache/file/D1B344A6-E801-43A0-B789552612B42988_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/D1B344A6-E801-43A0-B789552612B42988_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1998-05-01">May 1998</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1998/04-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/51E8A645-C5CF-418D-9204D31930B97B7A_source.jpg?w=600" alt="Scientific American Magazine Vol 278 Issue 4" srcSet="https://static.scientificamerican.com/sciam/cache/file/51E8A645-C5CF-418D-9204D31930B97B7A_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/51E8A645-C5CF-418D-9204D31930B97B7A_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1998-04-01">April 1998</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1998/03-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/6FD19A13-B9C3-4FEB-B5717D348368F468_source.jpg?w=600" alt="Scientific American Magazine Vol 278 Issue 3" srcSet="https://static.scientificamerican.com/sciam/cache/file/6FD19A13-B9C3-4FEB-B5717D348368F468_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/6FD19A13-B9C3-4FEB-B5717D348368F468_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1998-03-01">March 1998</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1998/02-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img 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class="issue__date-ozuG1"><time dateTime="1997-08-01">August 1997</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1997/07-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/E795ADC7-180F-47C4-940613639BBBBB45_source.jpg?w=600" alt="Scientific American Magazine Vol 277 Issue 1" srcSet="https://static.scientificamerican.com/sciam/cache/file/E795ADC7-180F-47C4-940613639BBBBB45_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/E795ADC7-180F-47C4-940613639BBBBB45_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1997-07-01">July 1997</time></div></div></div></a></div><div class="list__item--tR3J"><a 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width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1997-01-01">January 1997</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1996/12-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/4ECDB4C9-BCFD-4663-A6B5C2141BF488F5_source.jpg?w=600" alt="Scientific American Magazine Vol 275 Issue 6" srcSet="https://static.scientificamerican.com/sciam/cache/file/4ECDB4C9-BCFD-4663-A6B5C2141BF488F5_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/4ECDB4C9-BCFD-4663-A6B5C2141BF488F5_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1996-12-01">December 1996</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1996/11-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/F2D0843A-F766-41F6-8F1F60976C9D7CF7_source.jpg?w=600" alt="Scientific American Magazine Vol 275 Issue 5" srcSet="https://static.scientificamerican.com/sciam/cache/file/F2D0843A-F766-41F6-8F1F60976C9D7CF7_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/F2D0843A-F766-41F6-8F1F60976C9D7CF7_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1996-11-01">November 1996</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1996/10-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/6A090CBA-A86B-4F8F-A1B3502F88BB7258_source.jpg?w=600" alt="Scientific American Magazine Vol 275 Issue 4" srcSet="https://static.scientificamerican.com/sciam/cache/file/6A090CBA-A86B-4F8F-A1B3502F88BB7258_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/6A090CBA-A86B-4F8F-A1B3502F88BB7258_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1996-10-01">October 1996</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1996/09-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/EFA711DF-152C-4A25-8CF7B2F6B01D456D_source.jpg?w=600" alt="Scientific American Magazine Vol 275 Issue 3" srcSet="https://static.scientificamerican.com/sciam/cache/file/EFA711DF-152C-4A25-8CF7B2F6B01D456D_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/EFA711DF-152C-4A25-8CF7B2F6B01D456D_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1996-09-01">September 1996</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1996/08-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/445F7A80-FCDA-46D2-905AB345621D5D44_source.jpg?w=600" alt="Scientific American Magazine Vol 275 Issue 2" srcSet="https://static.scientificamerican.com/sciam/cache/file/445F7A80-FCDA-46D2-905AB345621D5D44_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/445F7A80-FCDA-46D2-905AB345621D5D44_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1996-08-01">August 1996</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1996/07-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/C179F495-DBEA-480F-A72822D3812517D5_source.jpg?w=600" alt="Scientific American Magazine Vol 275 Issue 1" srcSet="https://static.scientificamerican.com/sciam/cache/file/C179F495-DBEA-480F-A72822D3812517D5_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/C179F495-DBEA-480F-A72822D3812517D5_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1996-07-01">July 1996</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1996/06-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/BEA562BB-0312-4093-848A98204E8CBD08_source.jpg?w=600" alt="Scientific American Magazine Vol 274 Issue 6" srcSet="https://static.scientificamerican.com/sciam/cache/file/BEA562BB-0312-4093-848A98204E8CBD08_source.jpg?w=300 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width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1996-05-01">May 1996</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1996/04-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/98974A5E-0BB6-4FC5-9103C642BF42FA72_source.jpg?w=600" alt="Scientific American Magazine Vol 274 Issue 4" srcSet="https://static.scientificamerican.com/sciam/cache/file/98974A5E-0BB6-4FC5-9103C642BF42FA72_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/98974A5E-0BB6-4FC5-9103C642BF42FA72_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1996-04-01">April 1996</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1996/03-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/6F737CC5-6C79-4403-858B39C53DABFF5E_source.jpg?w=600" alt="Scientific American Magazine Vol 274 Issue 3" srcSet="https://static.scientificamerican.com/sciam/cache/file/6F737CC5-6C79-4403-858B39C53DABFF5E_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/6F737CC5-6C79-4403-858B39C53DABFF5E_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1996-03-01">March 1996</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1996/02-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/B9562B31-97D6-482A-9CCE94311200C3C0_source.jpg?w=600" alt="Scientific American Magazine Vol 274 Issue 2" srcSet="https://static.scientificamerican.com/sciam/cache/file/B9562B31-97D6-482A-9CCE94311200C3C0_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/B9562B31-97D6-482A-9CCE94311200C3C0_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1996-02-01">February 1996</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1996/01-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/44C4EFBC-5F74-4BE0-AFE89D5BFBD7C292_source.jpg?w=600" alt="Scientific American Magazine Vol 274 Issue 1" srcSet="https://static.scientificamerican.com/sciam/cache/file/44C4EFBC-5F74-4BE0-AFE89D5BFBD7C292_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/44C4EFBC-5F74-4BE0-AFE89D5BFBD7C292_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1996-01-01">January 1996</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1995/12-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/3333E958-8422-4899-9776972B9990CA08_source.jpg?w=600" alt="Scientific American Magazine Vol 273 Issue 6" srcSet="https://static.scientificamerican.com/sciam/cache/file/3333E958-8422-4899-9776972B9990CA08_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/3333E958-8422-4899-9776972B9990CA08_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1995-12-01">December 1995</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1995/11-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/84F83DBA-8193-4965-9F21F1E142E920F6_source.jpg?w=600" alt="Scientific American Magazine Vol 273 Issue 5" srcSet="https://static.scientificamerican.com/sciam/cache/file/84F83DBA-8193-4965-9F21F1E142E920F6_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/84F83DBA-8193-4965-9F21F1E142E920F6_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1995-11-01">November 1995</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1995/10-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/43538056-06E5-4EFE-998D67302C558CC5_source.jpg?w=600" alt="Scientific American Magazine Vol 273 Issue 4" srcSet="https://static.scientificamerican.com/sciam/cache/file/43538056-06E5-4EFE-998D67302C558CC5_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/43538056-06E5-4EFE-998D67302C558CC5_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1995-10-01">October 1995</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1995/09-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/FDE16C26-38CD-482C-ADE2440E6D9B97AC_source.jpg?w=600" alt="Scientific American Magazine Vol 273 Issue 3" srcSet="https://static.scientificamerican.com/sciam/cache/file/FDE16C26-38CD-482C-ADE2440E6D9B97AC_source.jpg?w=300 300w, 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width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1995-08-01">August 1995</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1995/07-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/5164FA13-5979-44F5-9C5D7462D182BC59_source.jpg?w=600" alt="Scientific American Magazine Vol 273 Issue 1" srcSet="https://static.scientificamerican.com/sciam/cache/file/5164FA13-5979-44F5-9C5D7462D182BC59_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/5164FA13-5979-44F5-9C5D7462D182BC59_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1995-07-01">July 1995</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1995/06-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/60F5C767-E272-4D55-AE89164F922A5DBF_source.jpg?w=600" alt="Scientific American Magazine Vol 272 Issue 6" srcSet="https://static.scientificamerican.com/sciam/cache/file/60F5C767-E272-4D55-AE89164F922A5DBF_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/60F5C767-E272-4D55-AE89164F922A5DBF_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1995-06-01">June 1995</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1995/05-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/7A04FF30-7524-4311-927898F95FD4279F_source.jpg?w=600" alt="Scientific American Magazine Vol 272 Issue 5" srcSet="https://static.scientificamerican.com/sciam/cache/file/7A04FF30-7524-4311-927898F95FD4279F_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/7A04FF30-7524-4311-927898F95FD4279F_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1995-05-01">May 1995</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1995/04-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/240C80B5-DB45-46A1-8E71B44FFED80B9C_source.jpg?w=600" alt="Scientific American Magazine Vol 272 Issue 4" srcSet="https://static.scientificamerican.com/sciam/cache/file/240C80B5-DB45-46A1-8E71B44FFED80B9C_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/240C80B5-DB45-46A1-8E71B44FFED80B9C_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1995-04-01">April 1995</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1995/03-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/23277643-2629-4B53-B14B8285A214ABCD_source.jpg?w=600" alt="Scientific American Magazine Vol 272 Issue 3" srcSet="https://static.scientificamerican.com/sciam/cache/file/23277643-2629-4B53-B14B8285A214ABCD_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/23277643-2629-4B53-B14B8285A214ABCD_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1995-03-01">March 1995</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1995/02-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/D6A013AD-C509-4E2B-B0E9D9D7B0A11083_source.jpg?w=600" alt="Scientific American 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loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1994-11-01">November 1994</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1994/10-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/64D296CD-C8E4-4FDB-A42E25DD42F1E162_source.jpg?w=600" alt="Scientific American Magazine Vol 271 Issue 4" srcSet="https://static.scientificamerican.com/sciam/cache/file/64D296CD-C8E4-4FDB-A42E25DD42F1E162_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/64D296CD-C8E4-4FDB-A42E25DD42F1E162_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1994-10-01">October 1994</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1994/09-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/C01DE65D-FE39-4296-9740CD486EB57052_source.jpg?w=600" alt="Scientific American Magazine Vol 271 Issue 3" srcSet="https://static.scientificamerican.com/sciam/cache/file/C01DE65D-FE39-4296-9740CD486EB57052_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/C01DE65D-FE39-4296-9740CD486EB57052_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1994-09-01">September 1994</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1994/08-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/CCF986A5-BCE8-4AA9-99F0A4C232CF1942_source.jpg?w=600" alt="Scientific American Magazine Vol 271 Issue 2" srcSet="https://static.scientificamerican.com/sciam/cache/file/CCF986A5-BCE8-4AA9-99F0A4C232CF1942_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/CCF986A5-BCE8-4AA9-99F0A4C232CF1942_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1994-08-01">August 1994</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1994/07-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/E3713309-21A3-4137-B059E045E98E8608_source.jpg?w=600" alt="Scientific American Magazine Vol 271 Issue 1" srcSet="https://static.scientificamerican.com/sciam/cache/file/E3713309-21A3-4137-B059E045E98E8608_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/E3713309-21A3-4137-B059E045E98E8608_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1994-07-01">July 1994</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1994/06-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" 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width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1994-03-01">March 1994</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1994/02-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/CEE7C65B-2257-4188-9A0D87B49BC5F58F_source.jpg?w=600" alt="Scientific American Magazine Vol 270 Issue 2" srcSet="https://static.scientificamerican.com/sciam/cache/file/CEE7C65B-2257-4188-9A0D87B49BC5F58F_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/CEE7C65B-2257-4188-9A0D87B49BC5F58F_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1994-02-01">February 1994</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1994/01-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/A3DD28B2-F6C7-46A1-AC6B75F47C8252A1_source.jpg?w=600" alt="Scientific American Magazine Vol 270 Issue 1" srcSet="https://static.scientificamerican.com/sciam/cache/file/A3DD28B2-F6C7-46A1-AC6B75F47C8252A1_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/A3DD28B2-F6C7-46A1-AC6B75F47C8252A1_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1994-01-01">January 1994</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1993/12-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/7F276466-DDC2-4CB1-B38D02841EC0C8FB_source.jpg?w=600" alt="Scientific American Magazine Vol 269 Issue 6" srcSet="https://static.scientificamerican.com/sciam/cache/file/7F276466-DDC2-4CB1-B38D02841EC0C8FB_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/7F276466-DDC2-4CB1-B38D02841EC0C8FB_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1993-12-01">December 1993</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1993/11-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img 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https://static.scientificamerican.com/sciam/cache/file/BE4C2CAD-A779-48BF-A3A52CE2D471AE4A_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1993-07-01">July 1993</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1993/06-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/45E696C0-7602-4A4B-BD75505C649FD067_source.jpg?w=600" alt="Scientific American Magazine Vol 268 Issue 6" srcSet="https://static.scientificamerican.com/sciam/cache/file/45E696C0-7602-4A4B-BD75505C649FD067_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/45E696C0-7602-4A4B-BD75505C649FD067_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1993-06-01">June 1993</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1993/05-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/13E081A4-0618-4D94-9BE60D6438471AD0_source.jpg?w=600" alt="Scientific American Magazine Vol 268 Issue 5" srcSet="https://static.scientificamerican.com/sciam/cache/file/13E081A4-0618-4D94-9BE60D6438471AD0_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/13E081A4-0618-4D94-9BE60D6438471AD0_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1993-05-01">May 1993</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1993/04-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/B20ED252-5313-495D-A52F2953C499C2B0_source.jpg?w=600" alt="Scientific American Magazine Vol 268 Issue 4" srcSet="https://static.scientificamerican.com/sciam/cache/file/B20ED252-5313-495D-A52F2953C499C2B0_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/B20ED252-5313-495D-A52F2953C499C2B0_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1993-04-01">April 1993</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1993/03-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/7D4B1A95-B874-408A-B6603402C59B64E7_source.jpg?w=600" alt="Scientific American Magazine Vol 268 Issue 3" srcSet="https://static.scientificamerican.com/sciam/cache/file/7D4B1A95-B874-408A-B6603402C59B64E7_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/7D4B1A95-B874-408A-B6603402C59B64E7_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1993-03-01">March 1993</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1993/02-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/9612FE6D-A21C-422A-A35C3618939EAB9E_source.jpg?w=600" alt="Scientific American Magazine Vol 268 Issue 2" srcSet="https://static.scientificamerican.com/sciam/cache/file/9612FE6D-A21C-422A-A35C3618939EAB9E_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/9612FE6D-A21C-422A-A35C3618939EAB9E_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1993-02-01">February 1993</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1993/01-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/97B9DB67-B4C6-44E5-A00942071780BC5A_source.jpg?w=600" alt="Scientific American Magazine Vol 268 Issue 1" srcSet="https://static.scientificamerican.com/sciam/cache/file/97B9DB67-B4C6-44E5-A00942071780BC5A_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/97B9DB67-B4C6-44E5-A00942071780BC5A_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1993-01-01">January 1993</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1992/12-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/6126FE13-DBFC-4B7A-9B986BA083AF800C_source.jpg?w=600" alt="Scientific American 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loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1992-09-01">September 1992</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1992/08-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/6CF73AE4-9E6B-412E-B7A59C435247F866_source.jpg?w=600" alt="Scientific American Magazine Vol 267 Issue 2" srcSet="https://static.scientificamerican.com/sciam/cache/file/6CF73AE4-9E6B-412E-B7A59C435247F866_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/6CF73AE4-9E6B-412E-B7A59C435247F866_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1992-08-01">August 1992</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1992/07-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/A88FBB2E-213E-4001-B69A8D2C1D8D995F_source.jpg?w=600" alt="Scientific American Magazine Vol 267 Issue 1" srcSet="https://static.scientificamerican.com/sciam/cache/file/A88FBB2E-213E-4001-B69A8D2C1D8D995F_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/A88FBB2E-213E-4001-B69A8D2C1D8D995F_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1992-07-01">July 1992</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1992/06-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/CB890AC6-4F9E-4D99-A132C0F1826D99C6_source.jpg?w=600" alt="Scientific American Magazine Vol 266 Issue 6" srcSet="https://static.scientificamerican.com/sciam/cache/file/CB890AC6-4F9E-4D99-A132C0F1826D99C6_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/CB890AC6-4F9E-4D99-A132C0F1826D99C6_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1992-06-01">June 1992</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1992/05-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/609C6325-DD2E-4719-8D9D2F3266D2A1BC_source.jpg?w=600" alt="Scientific American Magazine Vol 266 Issue 5" srcSet="https://static.scientificamerican.com/sciam/cache/file/609C6325-DD2E-4719-8D9D2F3266D2A1BC_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/609C6325-DD2E-4719-8D9D2F3266D2A1BC_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1992-05-01">May 1992</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1992/04-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/1028F0A3-4497-4FD6-9026ACAE31A29DD4_source.jpg?w=600" alt="Scientific American Magazine Vol 266 Issue 4" srcSet="https://static.scientificamerican.com/sciam/cache/file/1028F0A3-4497-4FD6-9026ACAE31A29DD4_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/1028F0A3-4497-4FD6-9026ACAE31A29DD4_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1992-04-01">April 1992</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1992/03-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/2D1B0506-2556-45AC-BE7D9729F093BE76_source.jpg?w=600" alt="Scientific American 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width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1992-01-01">January 1992</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1991/12-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/9501375E-7EC5-4CE5-92D1033EA8AF6445_source.jpg?w=600" alt="Scientific American Magazine Vol 265 Issue 6" srcSet="https://static.scientificamerican.com/sciam/cache/file/9501375E-7EC5-4CE5-92D1033EA8AF6445_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/9501375E-7EC5-4CE5-92D1033EA8AF6445_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1991-12-01">December 1991</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1991/11-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/35EA043E-1A30-4C08-AC220D616D06ADF2_source.jpg?w=600" alt="Scientific American Magazine Vol 265 Issue 5" srcSet="https://static.scientificamerican.com/sciam/cache/file/35EA043E-1A30-4C08-AC220D616D06ADF2_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/35EA043E-1A30-4C08-AC220D616D06ADF2_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1991-11-01">November 1991</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1991/10-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/A44A43ED-92DA-4EBF-9A389FE05017D8E8_source.jpg?w=600" alt="Scientific American Magazine Vol 265 Issue 4" srcSet="https://static.scientificamerican.com/sciam/cache/file/A44A43ED-92DA-4EBF-9A389FE05017D8E8_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/A44A43ED-92DA-4EBF-9A389FE05017D8E8_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1991-10-01">October 1991</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1991/09-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/05415C2C-E6D8-49FD-978DB9AEA05856C2_source.jpg?w=600" alt="Scientific American Magazine Vol 265 Issue 3" srcSet="https://static.scientificamerican.com/sciam/cache/file/05415C2C-E6D8-49FD-978DB9AEA05856C2_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/05415C2C-E6D8-49FD-978DB9AEA05856C2_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1991-09-01">September 1991</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1991/08-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" 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width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1991-05-01">May 1991</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1991/04-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/1CF23060-070D-4D70-984784CD4CF23EDB_source.jpg?w=600" alt="Scientific American Magazine Vol 264 Issue 4" srcSet="https://static.scientificamerican.com/sciam/cache/file/1CF23060-070D-4D70-984784CD4CF23EDB_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/1CF23060-070D-4D70-984784CD4CF23EDB_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1991-04-01">April 1991</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1991/03-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/FFFC4F61-AA0A-4CE7-8257E21650BDC826_source.jpg?w=600" alt="Scientific American Magazine Vol 264 Issue 3" srcSet="https://static.scientificamerican.com/sciam/cache/file/FFFC4F61-AA0A-4CE7-8257E21650BDC826_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/FFFC4F61-AA0A-4CE7-8257E21650BDC826_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1991-03-01">March 1991</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1991/02-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/9D80B08B-1993-4017-BB07457BB1DDA2F5_source.jpg?w=600" alt="Scientific American Magazine Vol 264 Issue 2" srcSet="https://static.scientificamerican.com/sciam/cache/file/9D80B08B-1993-4017-BB07457BB1DDA2F5_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/9D80B08B-1993-4017-BB07457BB1DDA2F5_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1991-02-01">February 1991</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1991/01-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img 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width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1990-08-01">August 1990</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1990/07-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/5DE27A49-1A5A-4DA4-8F2387EF3B1E8968_source.jpg?w=600" alt="Scientific American Magazine Vol 263 Issue 1" srcSet="https://static.scientificamerican.com/sciam/cache/file/5DE27A49-1A5A-4DA4-8F2387EF3B1E8968_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/5DE27A49-1A5A-4DA4-8F2387EF3B1E8968_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1990-07-01">July 1990</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1990/06-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/C9AE9FA4-7613-4D82-82819657BB83CD80_source.jpg?w=600" alt="Scientific American Magazine Vol 262 Issue 6" srcSet="https://static.scientificamerican.com/sciam/cache/file/C9AE9FA4-7613-4D82-82819657BB83CD80_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/C9AE9FA4-7613-4D82-82819657BB83CD80_source.jpg?w=600 600w" sizes="300px" width="300" loading="lazy"/></figure></div></div><div class="issue__info-Wrv5W"><h3 class="issue__title-rRMdq">Scientific American</h3><div class="issue__date-ozuG1"><time dateTime="1990-06-01">June 1990</time></div></div></div></a></div><div class="list__item--tR3J"><a 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