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0.5rem;font-weight:400;text-decoration:none" href="/archive/issues/1986/">1986</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/1987/">1987</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/1988/">1988</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/1989/">1989</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/1990/">1990</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/1991/">1991</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/1992/">1992</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/1993/">1993</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/1994/">1994</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/1995/">1995</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/1996/">1996</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/1997/">1997</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/1998/">1998</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/1999/">1999</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/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" href="/archive/issues/2009/">2009</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/2010/">2010</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/2011/">2011</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/2012/">2012</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/2013/">2013</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/2014/">2014</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/2015/">2015</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/2016/">2016</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/2017/">2017</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/2018/">2018</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/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></div></div></div><div class="issue__list-8JHD2"><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1969/12-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/B76D59A2-F70A-416F-9713E8E2C96FC99F_source.jpg?w=600" alt="Scientific American Magazine Vol 221 Issue 6" srcSet="https://static.scientificamerican.com/sciam/cache/file/B76D59A2-F70A-416F-9713E8E2C96FC99F_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/B76D59A2-F70A-416F-9713E8E2C96FC99F_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="1969-12-01">December 1969</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1969/11-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/4BDA5B27-6B96-45C9-BEA36EFFC173A422_source.jpg?w=600" alt="Scientific American Magazine Vol 221 Issue 5" srcSet="https://static.scientificamerican.com/sciam/cache/file/4BDA5B27-6B96-45C9-BEA36EFFC173A422_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/4BDA5B27-6B96-45C9-BEA36EFFC173A422_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="1969-11-01">November 1969</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1969/10-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/4EE7E5CD-BABE-499A-9C6B91D847CB67FE_source.jpg?w=600" alt="Scientific American Magazine Vol 221 Issue 4" srcSet="https://static.scientificamerican.com/sciam/cache/file/4EE7E5CD-BABE-499A-9C6B91D847CB67FE_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/4EE7E5CD-BABE-499A-9C6B91D847CB67FE_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="1969-10-01">October 1969</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1969/09-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/E2637B06-7C76-4C72-9E50E1A176AE12F0_source.jpg?w=600" alt="Scientific American Magazine Vol 221 Issue 3" srcSet="https://static.scientificamerican.com/sciam/cache/file/E2637B06-7C76-4C72-9E50E1A176AE12F0_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/E2637B06-7C76-4C72-9E50E1A176AE12F0_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="1969-09-01">September 1969</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1969/08-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/E069EAC7-4F87-40D6-9F441F423845D3B5_source.jpg?w=600" alt="Scientific American Magazine Vol 221 Issue 2" srcSet="https://static.scientificamerican.com/sciam/cache/file/E069EAC7-4F87-40D6-9F441F423845D3B5_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/E069EAC7-4F87-40D6-9F441F423845D3B5_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="1969-08-01">August 1969</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1969/07-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/E65F8E54-8277-451C-B83A412DD2FD5E85_source.jpg?w=600" alt="Scientific American Magazine Vol 221 Issue 1" srcSet="https://static.scientificamerican.com/sciam/cache/file/E65F8E54-8277-451C-B83A412DD2FD5E85_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/E65F8E54-8277-451C-B83A412DD2FD5E85_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="1969-07-01">July 1969</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1969/06-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/364A3A55-047E-4AD1-8A6507DBE7152595_source.jpg?w=600" alt="Scientific American Magazine Vol 220 Issue 6" srcSet="https://static.scientificamerican.com/sciam/cache/file/364A3A55-047E-4AD1-8A6507DBE7152595_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/364A3A55-047E-4AD1-8A6507DBE7152595_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="1969-06-01">June 1969</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1969/05-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/E880647C-ADB5-44AD-A4B887F11C949FDB_source.jpg?w=600" alt="Scientific American Magazine Vol 220 Issue 5" srcSet="https://static.scientificamerican.com/sciam/cache/file/E880647C-ADB5-44AD-A4B887F11C949FDB_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/E880647C-ADB5-44AD-A4B887F11C949FDB_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="1969-05-01">May 1969</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1969/04-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/1ED16044-23C2-4540-8FE267FD7031D010_source.jpg?w=600" alt="Scientific American Magazine Vol 220 Issue 4" srcSet="https://static.scientificamerican.com/sciam/cache/file/1ED16044-23C2-4540-8FE267FD7031D010_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/1ED16044-23C2-4540-8FE267FD7031D010_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="1969-04-01">April 1969</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1969/03-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/E208E212-4C21-4478-924A6B0FCB1CE211_source.jpg?w=600" alt="Scientific American Magazine Vol 220 Issue 3" srcSet="https://static.scientificamerican.com/sciam/cache/file/E208E212-4C21-4478-924A6B0FCB1CE211_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/E208E212-4C21-4478-924A6B0FCB1CE211_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="1969-03-01">March 1969</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1969/02-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/8000B9FD-6D26-4862-BAED54CA3DB7125A_source.jpg?w=600" alt="Scientific American Magazine Vol 220 Issue 2" srcSet="https://static.scientificamerican.com/sciam/cache/file/8000B9FD-6D26-4862-BAED54CA3DB7125A_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/8000B9FD-6D26-4862-BAED54CA3DB7125A_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="1969-02-01">February 1969</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1969/01-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/8D0DD30B-ED07-416B-87ED122D89DB7EFF_source.jpg?w=600" alt="Scientific American Magazine Vol 220 Issue 1" srcSet="https://static.scientificamerican.com/sciam/cache/file/8D0DD30B-ED07-416B-87ED122D89DB7EFF_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/8D0DD30B-ED07-416B-87ED122D89DB7EFF_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="1969-01-01">January 1969</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1968/12-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/9768C880-5E97-48C2-BB0AD3B97B01BCB6_source.jpg?w=600" alt="Scientific American Magazine Vol 219 Issue 6" srcSet="https://static.scientificamerican.com/sciam/cache/file/9768C880-5E97-48C2-BB0AD3B97B01BCB6_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/9768C880-5E97-48C2-BB0AD3B97B01BCB6_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="1968-12-01">December 1968</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1968/11-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/8C49A2B2-5614-4E18-B5DD8C43AC88FAF8_source.jpg?w=600" alt="Scientific American Magazine Vol 219 Issue 5" srcSet="https://static.scientificamerican.com/sciam/cache/file/8C49A2B2-5614-4E18-B5DD8C43AC88FAF8_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/8C49A2B2-5614-4E18-B5DD8C43AC88FAF8_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="1968-11-01">November 1968</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1968/10-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/9FF7686C-A326-453A-A928F2784432F7E8_source.jpg?w=600" alt="Scientific American Magazine Vol 219 Issue 4" srcSet="https://static.scientificamerican.com/sciam/cache/file/9FF7686C-A326-453A-A928F2784432F7E8_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/9FF7686C-A326-453A-A928F2784432F7E8_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="1968-10-01">October 1968</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1968/09-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/804B9A6E-93B2-4916-91232EC121D46960_source.jpg?w=600" alt="Scientific American Magazine Vol 219 Issue 3" srcSet="https://static.scientificamerican.com/sciam/cache/file/804B9A6E-93B2-4916-91232EC121D46960_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/804B9A6E-93B2-4916-91232EC121D46960_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="1968-09-01">September 1968</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1968/08-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/EB37778F-ADDE-4DAD-B20A855FB7B6FB91_source.jpg?w=600" alt="Scientific American Magazine Vol 219 Issue 2" srcSet="https://static.scientificamerican.com/sciam/cache/file/EB37778F-ADDE-4DAD-B20A855FB7B6FB91_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/EB37778F-ADDE-4DAD-B20A855FB7B6FB91_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="1968-08-01">August 1968</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1968/07-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/C9875096-95B9-4833-9C95A7A04C351D7C_source.jpg?w=600" alt="Scientific American Magazine Vol 219 Issue 1" srcSet="https://static.scientificamerican.com/sciam/cache/file/C9875096-95B9-4833-9C95A7A04C351D7C_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/C9875096-95B9-4833-9C95A7A04C351D7C_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="1968-07-01">July 1968</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1968/06-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/FB3B545F-9A47-4299-B8A30BA1DFD21B69_source.jpg?w=600" alt="Scientific American Magazine Vol 218 Issue 6" srcSet="https://static.scientificamerican.com/sciam/cache/file/FB3B545F-9A47-4299-B8A30BA1DFD21B69_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/FB3B545F-9A47-4299-B8A30BA1DFD21B69_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="1968-06-01">June 1968</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1968/05-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/11FE823A-EE69-4B18-A07C6DB2553F2CD6_source.jpg?w=600" alt="Scientific American Magazine Vol 218 Issue 5" srcSet="https://static.scientificamerican.com/sciam/cache/file/11FE823A-EE69-4B18-A07C6DB2553F2CD6_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/11FE823A-EE69-4B18-A07C6DB2553F2CD6_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="1968-05-01">May 1968</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1968/04-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/A4732216-26DF-4A4E-AD5706010B3A0565_source.jpg?w=600" alt="Scientific American Magazine Vol 218 Issue 4" srcSet="https://static.scientificamerican.com/sciam/cache/file/A4732216-26DF-4A4E-AD5706010B3A0565_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/A4732216-26DF-4A4E-AD5706010B3A0565_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="1968-04-01">April 1968</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1968/03-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/FF2AE36D-77DB-47CE-A046D4C67638EAC2_source.jpg?w=600" alt="Scientific American Magazine Vol 218 Issue 3" srcSet="https://static.scientificamerican.com/sciam/cache/file/FF2AE36D-77DB-47CE-A046D4C67638EAC2_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/FF2AE36D-77DB-47CE-A046D4C67638EAC2_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="1968-03-01">March 1968</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1968/02-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/018BDBDF-4703-4190-BDA1B39FD79BF91C_source.jpg?w=600" alt="Scientific American Magazine Vol 218 Issue 2" srcSet="https://static.scientificamerican.com/sciam/cache/file/018BDBDF-4703-4190-BDA1B39FD79BF91C_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/018BDBDF-4703-4190-BDA1B39FD79BF91C_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="1968-02-01">February 1968</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1968/01-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/200A3523-2E01-403A-85630D5EFB892903_source.jpg?w=600" alt="Scientific American Magazine Vol 218 Issue 1" srcSet="https://static.scientificamerican.com/sciam/cache/file/200A3523-2E01-403A-85630D5EFB892903_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/200A3523-2E01-403A-85630D5EFB892903_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="1968-01-01">January 1968</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1967/12-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/0F2D6667-DF67-4A9B-B19C58A0885EF7E2_source.jpg?w=600" alt="Scientific American Magazine Vol 217 Issue 6" srcSet="https://static.scientificamerican.com/sciam/cache/file/0F2D6667-DF67-4A9B-B19C58A0885EF7E2_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/0F2D6667-DF67-4A9B-B19C58A0885EF7E2_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="1967-12-01">December 1967</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1967/11-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/860E8141-61EE-4B81-BACC7ED97F8A404B_source.jpg?w=600" alt="Scientific American Magazine Vol 217 Issue 5" srcSet="https://static.scientificamerican.com/sciam/cache/file/860E8141-61EE-4B81-BACC7ED97F8A404B_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/860E8141-61EE-4B81-BACC7ED97F8A404B_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="1967-11-01">November 1967</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1967/10-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/EF05FC7B-0E12-48A5-A4FBB5EB3C9CA02A_source.jpg?w=600" alt="Scientific American Magazine Vol 217 Issue 4" srcSet="https://static.scientificamerican.com/sciam/cache/file/EF05FC7B-0E12-48A5-A4FBB5EB3C9CA02A_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/EF05FC7B-0E12-48A5-A4FBB5EB3C9CA02A_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="1967-10-01">October 1967</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1967/09-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/5F04958C-8649-43F9-8A25D9C817B527A1_source.jpg?w=600" alt="Scientific American Magazine Vol 217 Issue 3" srcSet="https://static.scientificamerican.com/sciam/cache/file/5F04958C-8649-43F9-8A25D9C817B527A1_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/5F04958C-8649-43F9-8A25D9C817B527A1_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="1967-09-01">September 1967</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1967/08-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/A358E8A4-052E-47D9-A1D8A8F5C4DFFBCF_source.jpg?w=600" alt="Scientific American Magazine Vol 217 Issue 2" srcSet="https://static.scientificamerican.com/sciam/cache/file/A358E8A4-052E-47D9-A1D8A8F5C4DFFBCF_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/A358E8A4-052E-47D9-A1D8A8F5C4DFFBCF_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="1967-08-01">August 1967</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1967/07-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/11D86CB0-7E09-4AEA-9EE33D6D2F5A6FFD_source.jpg?w=600" alt="Scientific American Magazine Vol 217 Issue 1" srcSet="https://static.scientificamerican.com/sciam/cache/file/11D86CB0-7E09-4AEA-9EE33D6D2F5A6FFD_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/11D86CB0-7E09-4AEA-9EE33D6D2F5A6FFD_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="1967-07-01">July 1967</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1967/06-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/20046F17-3F30-4845-8840D59534243889_source.jpg?w=600" alt="Scientific American Magazine Vol 216 Issue 6" srcSet="https://static.scientificamerican.com/sciam/cache/file/20046F17-3F30-4845-8840D59534243889_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/20046F17-3F30-4845-8840D59534243889_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="1967-06-01">June 1967</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1967/05-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/D57FA379-F232-4E8B-9FE858272EF82E4E_source.jpg?w=600" alt="Scientific American Magazine Vol 216 Issue 5" srcSet="https://static.scientificamerican.com/sciam/cache/file/D57FA379-F232-4E8B-9FE858272EF82E4E_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/D57FA379-F232-4E8B-9FE858272EF82E4E_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="1967-05-01">May 1967</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1967/04-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/FB3F29D9-8EB0-4E9C-8B415E1426F7F76D_source.jpg?w=600" alt="Scientific American Magazine Vol 216 Issue 4" srcSet="https://static.scientificamerican.com/sciam/cache/file/FB3F29D9-8EB0-4E9C-8B415E1426F7F76D_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/FB3F29D9-8EB0-4E9C-8B415E1426F7F76D_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="1967-04-01">April 1967</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1967/03-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/963498B6-F7CC-4CCC-9579319F6659AD34_source.jpg?w=600" alt="Scientific American Magazine Vol 216 Issue 3" srcSet="https://static.scientificamerican.com/sciam/cache/file/963498B6-F7CC-4CCC-9579319F6659AD34_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/963498B6-F7CC-4CCC-9579319F6659AD34_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="1967-03-01">March 1967</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1967/02-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/E69CFA58-E9D5-4D21-968A1A59CA8E3EFF_source.jpg?w=600" alt="Scientific American Magazine Vol 216 Issue 2" srcSet="https://static.scientificamerican.com/sciam/cache/file/E69CFA58-E9D5-4D21-968A1A59CA8E3EFF_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/E69CFA58-E9D5-4D21-968A1A59CA8E3EFF_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="1967-02-01">February 1967</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1967/01-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/B706EBF9-B66C-4687-ACF53FA64822A3C0_source.jpg?w=600" alt="Scientific American Magazine Vol 216 Issue 1" srcSet="https://static.scientificamerican.com/sciam/cache/file/B706EBF9-B66C-4687-ACF53FA64822A3C0_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/B706EBF9-B66C-4687-ACF53FA64822A3C0_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="1967-01-01">January 1967</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1966/12-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/AA954398-D722-44FE-85B2E091468200BC_source.jpg?w=600" alt="Scientific American Magazine Vol 215 Issue 6" srcSet="https://static.scientificamerican.com/sciam/cache/file/AA954398-D722-44FE-85B2E091468200BC_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/AA954398-D722-44FE-85B2E091468200BC_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="1966-12-01">December 1966</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1966/11-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/B9043168-65B9-42CA-9C79D348BCA28E75_source.jpg?w=600" alt="Scientific American Magazine Vol 215 Issue 5" srcSet="https://static.scientificamerican.com/sciam/cache/file/B9043168-65B9-42CA-9C79D348BCA28E75_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/B9043168-65B9-42CA-9C79D348BCA28E75_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="1966-11-01">November 1966</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1966/10-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/4E66E2AE-605B-47E1-801F271514925F81_source.jpg?w=600" alt="Scientific American Magazine Vol 215 Issue 4" srcSet="https://static.scientificamerican.com/sciam/cache/file/4E66E2AE-605B-47E1-801F271514925F81_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/4E66E2AE-605B-47E1-801F271514925F81_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="1966-10-01">October 1966</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1966/09-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/8677AC95-DE62-422C-8016020B433B9796_source.jpg?w=600" alt="Scientific American Magazine Vol 215 Issue 3" srcSet="https://static.scientificamerican.com/sciam/cache/file/8677AC95-DE62-422C-8016020B433B9796_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/8677AC95-DE62-422C-8016020B433B9796_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="1966-09-01">September 1966</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1966/08-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/F61AA886-A4EA-4B0D-8D83239C548026F4_source.jpg?w=600" alt="Scientific American Magazine Vol 215 Issue 2" srcSet="https://static.scientificamerican.com/sciam/cache/file/F61AA886-A4EA-4B0D-8D83239C548026F4_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/F61AA886-A4EA-4B0D-8D83239C548026F4_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="1966-08-01">August 1966</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1966/07-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/4E664C45-D090-4101-93DFA9B162130E16_source.jpg?w=600" alt="Scientific American Magazine Vol 215 Issue 1" srcSet="https://static.scientificamerican.com/sciam/cache/file/4E664C45-D090-4101-93DFA9B162130E16_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/4E664C45-D090-4101-93DFA9B162130E16_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="1966-07-01">July 1966</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1966/06-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/4A251743-35C9-483F-85930FE9C4DE7DF3_source.jpg?w=600" alt="Scientific American Magazine Vol 214 Issue 6" srcSet="https://static.scientificamerican.com/sciam/cache/file/4A251743-35C9-483F-85930FE9C4DE7DF3_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/4A251743-35C9-483F-85930FE9C4DE7DF3_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="1966-06-01">June 1966</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1966/05-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/8EF5CFDF-5C41-4581-B913CEA55596D9DF_source.jpg?w=600" alt="Scientific American Magazine Vol 214 Issue 5" srcSet="https://static.scientificamerican.com/sciam/cache/file/8EF5CFDF-5C41-4581-B913CEA55596D9DF_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/8EF5CFDF-5C41-4581-B913CEA55596D9DF_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="1966-05-01">May 1966</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1966/04-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img 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src="https://static.scientificamerican.com/sciam/cache/file/201EAEF6-2835-4BD0-B59F6239381BD0C9_source.jpg?w=600" alt="Scientific American Magazine Vol 214 Issue 3" srcSet="https://static.scientificamerican.com/sciam/cache/file/201EAEF6-2835-4BD0-B59F6239381BD0C9_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/201EAEF6-2835-4BD0-B59F6239381BD0C9_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="1966-03-01">March 1966</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1966/02-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/7DEC89F7-B6A7-47A9-9C744549896AF029_source.jpg?w=600" alt="Scientific American Magazine Vol 214 Issue 2" srcSet="https://static.scientificamerican.com/sciam/cache/file/7DEC89F7-B6A7-47A9-9C744549896AF029_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/7DEC89F7-B6A7-47A9-9C744549896AF029_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="1966-02-01">February 1966</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1966/01-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/A3BDB2DB-5807-464A-A8C5CB67853FF2D7_source.jpg?w=600" alt="Scientific American Magazine Vol 214 Issue 1" srcSet="https://static.scientificamerican.com/sciam/cache/file/A3BDB2DB-5807-464A-A8C5CB67853FF2D7_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/A3BDB2DB-5807-464A-A8C5CB67853FF2D7_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="1966-01-01">January 1966</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1965/12-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/57495C41-FAE1-4E85-BBD6CC258E44035B_source.jpg?w=600" alt="Scientific American Magazine Vol 213 Issue 6" srcSet="https://static.scientificamerican.com/sciam/cache/file/57495C41-FAE1-4E85-BBD6CC258E44035B_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/57495C41-FAE1-4E85-BBD6CC258E44035B_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="1965-12-01">December 1965</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1965/11-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/BF816360-E600-43E4-9E70413D40208664_source.jpg?w=600" alt="Scientific American Magazine Vol 213 Issue 5" srcSet="https://static.scientificamerican.com/sciam/cache/file/BF816360-E600-43E4-9E70413D40208664_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/BF816360-E600-43E4-9E70413D40208664_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="1965-11-01">November 1965</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1965/10-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/83299E62-0F84-4F4E-98A50992305EA5DC_source.jpg?w=600" alt="Scientific American Magazine Vol 213 Issue 4" srcSet="https://static.scientificamerican.com/sciam/cache/file/83299E62-0F84-4F4E-98A50992305EA5DC_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/83299E62-0F84-4F4E-98A50992305EA5DC_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="1965-10-01">October 1965</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1965/09-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/B4A783F1-09FD-4D5A-A12458FDB66DC89B_source.jpg?w=600" alt="Scientific American Magazine Vol 213 Issue 3" srcSet="https://static.scientificamerican.com/sciam/cache/file/B4A783F1-09FD-4D5A-A12458FDB66DC89B_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/B4A783F1-09FD-4D5A-A12458FDB66DC89B_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="1965-09-01">September 1965</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1965/08-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/2ABF8F97-CA36-442C-9BB529660B946256_source.jpg?w=600" alt="Scientific American Magazine Vol 213 Issue 2" srcSet="https://static.scientificamerican.com/sciam/cache/file/2ABF8F97-CA36-442C-9BB529660B946256_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/2ABF8F97-CA36-442C-9BB529660B946256_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="1965-08-01">August 1965</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1965/07-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/0B6FA63C-F27A-4982-A6F019680D204981_source.jpg?w=600" alt="Scientific American Magazine Vol 213 Issue 1" srcSet="https://static.scientificamerican.com/sciam/cache/file/0B6FA63C-F27A-4982-A6F019680D204981_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/0B6FA63C-F27A-4982-A6F019680D204981_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="1965-07-01">July 1965</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1965/06-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/28AE8F45-36A8-4246-BAEA4194AB39F2E6_source.jpg?w=600" alt="Scientific American Magazine Vol 212 Issue 6" srcSet="https://static.scientificamerican.com/sciam/cache/file/28AE8F45-36A8-4246-BAEA4194AB39F2E6_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/28AE8F45-36A8-4246-BAEA4194AB39F2E6_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="1965-06-01">June 1965</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1965/05-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/613739DA-CC3C-47D4-8A32387E79654009_source.jpg?w=600" alt="Scientific American Magazine Vol 212 Issue 5" srcSet="https://static.scientificamerican.com/sciam/cache/file/613739DA-CC3C-47D4-8A32387E79654009_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/613739DA-CC3C-47D4-8A32387E79654009_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="1965-05-01">May 1965</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1965/04-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/577BE633-C2E2-4039-8D12537AF5D47679_source.jpg?w=600" alt="Scientific American Magazine Vol 212 Issue 4" srcSet="https://static.scientificamerican.com/sciam/cache/file/577BE633-C2E2-4039-8D12537AF5D47679_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/577BE633-C2E2-4039-8D12537AF5D47679_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="1965-04-01">April 1965</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1965/03-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/0827E11D-4922-4932-9D5BF7B8509CCB09_source.jpg?w=600" alt="Scientific American Magazine Vol 212 Issue 3" srcSet="https://static.scientificamerican.com/sciam/cache/file/0827E11D-4922-4932-9D5BF7B8509CCB09_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/0827E11D-4922-4932-9D5BF7B8509CCB09_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="1965-03-01">March 1965</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1965/02-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/27980C04-1AB2-43B5-AC6424FC07CA916A_source.jpg?w=600" alt="Scientific American Magazine Vol 212 Issue 2" srcSet="https://static.scientificamerican.com/sciam/cache/file/27980C04-1AB2-43B5-AC6424FC07CA916A_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/27980C04-1AB2-43B5-AC6424FC07CA916A_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="1965-02-01">February 1965</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1965/01-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/810622AD-0127-42E6-B7B5D6286A7D44FF_source.jpg?w=600" alt="Scientific American Magazine Vol 212 Issue 1" srcSet="https://static.scientificamerican.com/sciam/cache/file/810622AD-0127-42E6-B7B5D6286A7D44FF_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/810622AD-0127-42E6-B7B5D6286A7D44FF_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="1965-01-01">January 1965</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1964/12-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/50A2A5B5-AF13-4145-BA8E6879E45C42BE_source.jpg?w=600" alt="Scientific American Magazine Vol 211 Issue 6" srcSet="https://static.scientificamerican.com/sciam/cache/file/50A2A5B5-AF13-4145-BA8E6879E45C42BE_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/50A2A5B5-AF13-4145-BA8E6879E45C42BE_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="1964-12-01">December 1964</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1964/11-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/47A2CA69-4C3F-457C-843C2E36BD2105A3_source.jpg?w=600" alt="Scientific American Magazine Vol 211 Issue 5" srcSet="https://static.scientificamerican.com/sciam/cache/file/47A2CA69-4C3F-457C-843C2E36BD2105A3_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/47A2CA69-4C3F-457C-843C2E36BD2105A3_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="1964-11-01">November 1964</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1964/10-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/FF29D550-D028-4623-B79EEE541D8C85B5_source.jpg?w=600" alt="Scientific American Magazine Vol 211 Issue 4" srcSet="https://static.scientificamerican.com/sciam/cache/file/FF29D550-D028-4623-B79EEE541D8C85B5_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/FF29D550-D028-4623-B79EEE541D8C85B5_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="1964-10-01">October 1964</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1964/09-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/14396C26-4FCF-413E-9C82C7227490EBFB_source.jpg?w=600" alt="Scientific American Magazine Vol 211 Issue 3" srcSet="https://static.scientificamerican.com/sciam/cache/file/14396C26-4FCF-413E-9C82C7227490EBFB_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/14396C26-4FCF-413E-9C82C7227490EBFB_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="1964-09-01">September 1964</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1964/08-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/83F60C2E-C93D-4BA6-8724913D6EB56ED9_source.jpg?w=600" alt="Scientific American Magazine Vol 211 Issue 2" 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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="1964-06-01">June 1964</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1964/05-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/AB845025-F59C-412F-AB26B4F01B1D56D7_source.jpg?w=600" alt="Scientific American Magazine Vol 210 Issue 5" srcSet="https://static.scientificamerican.com/sciam/cache/file/AB845025-F59C-412F-AB26B4F01B1D56D7_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/AB845025-F59C-412F-AB26B4F01B1D56D7_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="1964-05-01">May 1964</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1964/04-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/A73166FF-5BA1-47D1-B34BFA77A21A2372_source.jpg?w=600" alt="Scientific American Magazine Vol 210 Issue 4" srcSet="https://static.scientificamerican.com/sciam/cache/file/A73166FF-5BA1-47D1-B34BFA77A21A2372_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/A73166FF-5BA1-47D1-B34BFA77A21A2372_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="1964-04-01">April 1964</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1964/03-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/B237C774-9F95-4A44-807E1E9F41C40338_source.jpg?w=600" alt="Scientific American Magazine Vol 210 Issue 3" srcSet="https://static.scientificamerican.com/sciam/cache/file/B237C774-9F95-4A44-807E1E9F41C40338_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/B237C774-9F95-4A44-807E1E9F41C40338_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="1964-03-01">March 1964</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1964/02-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/191FB9DF-E382-4D77-BF9F0C52A663E9A4_source.jpg?w=600" alt="Scientific American Magazine Vol 210 Issue 2" srcSet="https://static.scientificamerican.com/sciam/cache/file/191FB9DF-E382-4D77-BF9F0C52A663E9A4_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/191FB9DF-E382-4D77-BF9F0C52A663E9A4_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="1964-02-01">February 1964</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1964/01-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/D6FBBD37-9B74-4310-9F691B368F00B5D5_source.jpg?w=600" alt="Scientific American Magazine Vol 210 Issue 1" srcSet="https://static.scientificamerican.com/sciam/cache/file/D6FBBD37-9B74-4310-9F691B368F00B5D5_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/D6FBBD37-9B74-4310-9F691B368F00B5D5_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="1964-01-01">January 1964</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1963/12-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/6E89730E-7796-4F4F-A7D8EB8AFC0BDC6F_source.jpg?w=600" alt="Scientific American Magazine Vol 209 Issue 6" srcSet="https://static.scientificamerican.com/sciam/cache/file/6E89730E-7796-4F4F-A7D8EB8AFC0BDC6F_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/6E89730E-7796-4F4F-A7D8EB8AFC0BDC6F_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="1963-12-01">December 1963</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1963/11-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/EA422A91-C8CE-4C66-A556C3E6102CA418_source.jpg?w=600" alt="Scientific American Magazine Vol 209 Issue 5" 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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="1963-09-01">September 1963</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1963/08-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/DBC0A1A8-053B-46B7-AFE2E385FE998646_source.jpg?w=600" alt="Scientific American Magazine Vol 209 Issue 2" srcSet="https://static.scientificamerican.com/sciam/cache/file/DBC0A1A8-053B-46B7-AFE2E385FE998646_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/DBC0A1A8-053B-46B7-AFE2E385FE998646_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="1963-08-01">August 1963</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1963/07-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/2038F905-109D-45A5-93C372D455122570_source.jpg?w=600" alt="Scientific American Magazine Vol 209 Issue 1" srcSet="https://static.scientificamerican.com/sciam/cache/file/2038F905-109D-45A5-93C372D455122570_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/2038F905-109D-45A5-93C372D455122570_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="1963-07-01">July 1963</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1963/06-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/948AC1EB-485D-49F8-992ED072F6B165C4_source.jpg?w=600" alt="Scientific American Magazine Vol 208 Issue 6" srcSet="https://static.scientificamerican.com/sciam/cache/file/948AC1EB-485D-49F8-992ED072F6B165C4_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/948AC1EB-485D-49F8-992ED072F6B165C4_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="1963-06-01">June 1963</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1963/05-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/3237AB16-E660-4980-AB9A667B0519DD5C_source.jpg?w=600" alt="Scientific American Magazine Vol 208 Issue 5" srcSet="https://static.scientificamerican.com/sciam/cache/file/3237AB16-E660-4980-AB9A667B0519DD5C_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/3237AB16-E660-4980-AB9A667B0519DD5C_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="1963-05-01">May 1963</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1963/04-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/3F60383B-B86E-4A38-87BD082EDF5AC40D_source.jpg?w=600" alt="Scientific American Magazine Vol 208 Issue 4" srcSet="https://static.scientificamerican.com/sciam/cache/file/3F60383B-B86E-4A38-87BD082EDF5AC40D_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/3F60383B-B86E-4A38-87BD082EDF5AC40D_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="1963-04-01">April 1963</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1963/03-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/64B23CF5-B301-4883-BEB3ABFA973226C3_source.jpg?w=600" alt="Scientific American Magazine Vol 208 Issue 3" srcSet="https://static.scientificamerican.com/sciam/cache/file/64B23CF5-B301-4883-BEB3ABFA973226C3_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/64B23CF5-B301-4883-BEB3ABFA973226C3_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="1963-03-01">March 1963</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1963/02-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/BCDBD431-D37A-4C0D-BFABF170C2C0190E_source.jpg?w=600" alt="Scientific American Magazine Vol 208 Issue 2" srcSet="https://static.scientificamerican.com/sciam/cache/file/BCDBD431-D37A-4C0D-BFABF170C2C0190E_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/BCDBD431-D37A-4C0D-BFABF170C2C0190E_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="1963-02-01">February 1963</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1963/01-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/63284DE0-2745-4375-A5234BEEDB962CDD_source.jpg?w=600" alt="Scientific American Magazine Vol 208 Issue 1" srcSet="https://static.scientificamerican.com/sciam/cache/file/63284DE0-2745-4375-A5234BEEDB962CDD_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/63284DE0-2745-4375-A5234BEEDB962CDD_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="1963-01-01">January 1963</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1962/12-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/8E6E05E5-F38E-4BB2-B21C888FF5C16123_source.jpg?w=600" alt="Scientific American Magazine Vol 207 Issue 6" srcSet="https://static.scientificamerican.com/sciam/cache/file/8E6E05E5-F38E-4BB2-B21C888FF5C16123_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/8E6E05E5-F38E-4BB2-B21C888FF5C16123_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="1962-12-01">December 1962</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1962/11-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/3E3FD0E4-C9C8-4C6C-8F3505D264BF73E7_source.jpg?w=600" alt="Scientific American Magazine Vol 207 Issue 5" srcSet="https://static.scientificamerican.com/sciam/cache/file/3E3FD0E4-C9C8-4C6C-8F3505D264BF73E7_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/3E3FD0E4-C9C8-4C6C-8F3505D264BF73E7_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="1962-11-01">November 1962</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1962/10-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/42E6824B-138A-4B36-BEA28D67BC95BC94_source.jpg?w=600" alt="Scientific American Magazine Vol 207 Issue 4" srcSet="https://static.scientificamerican.com/sciam/cache/file/42E6824B-138A-4B36-BEA28D67BC95BC94_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/42E6824B-138A-4B36-BEA28D67BC95BC94_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="1962-10-01">October 1962</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1962/09-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/DD52DC0B-214E-4049-9FF482E0B9E30C38_source.jpg?w=600" alt="Scientific American Magazine Vol 207 Issue 3" srcSet="https://static.scientificamerican.com/sciam/cache/file/DD52DC0B-214E-4049-9FF482E0B9E30C38_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/DD52DC0B-214E-4049-9FF482E0B9E30C38_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="1962-09-01">September 1962</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1962/08-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/544A4206-4457-42CD-966BC298143FBB1A_source.jpg?w=600" alt="Scientific American Magazine Vol 207 Issue 2" srcSet="https://static.scientificamerican.com/sciam/cache/file/544A4206-4457-42CD-966BC298143FBB1A_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/544A4206-4457-42CD-966BC298143FBB1A_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="1962-08-01">August 1962</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1962/07-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/81D1448B-2676-45C0-BD050C95ACA26C96_source.jpg?w=600" alt="Scientific American Magazine Vol 207 Issue 1" srcSet="https://static.scientificamerican.com/sciam/cache/file/81D1448B-2676-45C0-BD050C95ACA26C96_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/81D1448B-2676-45C0-BD050C95ACA26C96_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="1962-07-01">July 1962</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1962/06-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/70BE934A-2BD8-473E-9D80DBBDECCF7D32_source.jpg?w=600" alt="Scientific American Magazine Vol 206 Issue 6" srcSet="https://static.scientificamerican.com/sciam/cache/file/70BE934A-2BD8-473E-9D80DBBDECCF7D32_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="1962-05-01">May 1962</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1962/04-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/9727FE26-85B5-4F02-9B134522631B24C7_source.jpg?w=600" alt="Scientific American Magazine Vol 206 Issue 4" srcSet="https://static.scientificamerican.com/sciam/cache/file/9727FE26-85B5-4F02-9B134522631B24C7_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/9727FE26-85B5-4F02-9B134522631B24C7_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="1962-04-01">April 1962</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1962/03-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/3A2305C5-73A3-478B-9DC9C74A12982949_source.jpg?w=600" alt="Scientific American Magazine Vol 206 Issue 3" srcSet="https://static.scientificamerican.com/sciam/cache/file/3A2305C5-73A3-478B-9DC9C74A12982949_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/3A2305C5-73A3-478B-9DC9C74A12982949_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="1962-03-01">March 1962</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1962/02-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/A67DCDA7-D65D-4647-B969B96CC8E1D071_source.jpg?w=600" alt="Scientific American Magazine Vol 206 Issue 2" srcSet="https://static.scientificamerican.com/sciam/cache/file/A67DCDA7-D65D-4647-B969B96CC8E1D071_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/A67DCDA7-D65D-4647-B969B96CC8E1D071_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="1962-02-01">February 1962</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1962/01-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/1CF46968-E910-497E-8B0081FE8A2FF61D_source.jpg?w=600" alt="Scientific American Magazine Vol 206 Issue 1" srcSet="https://static.scientificamerican.com/sciam/cache/file/1CF46968-E910-497E-8B0081FE8A2FF61D_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/1CF46968-E910-497E-8B0081FE8A2FF61D_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="1962-01-01">January 1962</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1961/12-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/189AB063-96B8-4B47-8CD8EEF31C1E3054_source.jpg?w=600" alt="Scientific American Magazine Vol 205 Issue 6" srcSet="https://static.scientificamerican.com/sciam/cache/file/189AB063-96B8-4B47-8CD8EEF31C1E3054_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/189AB063-96B8-4B47-8CD8EEF31C1E3054_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="1961-12-01">December 1961</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1961/11-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/78E94356-9C03-4714-9A58BBEDD867E3F6_source.jpg?w=600" alt="Scientific American Magazine Vol 205 Issue 5" srcSet="https://static.scientificamerican.com/sciam/cache/file/78E94356-9C03-4714-9A58BBEDD867E3F6_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/78E94356-9C03-4714-9A58BBEDD867E3F6_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="1961-11-01">November 1961</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1961/10-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/24C76BF2-05F6-4475-BBDE813FAFDF2176_source.jpg?w=600" alt="Scientific American Magazine Vol 205 Issue 4" srcSet="https://static.scientificamerican.com/sciam/cache/file/24C76BF2-05F6-4475-BBDE813FAFDF2176_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/24C76BF2-05F6-4475-BBDE813FAFDF2176_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="1961-10-01">October 1961</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1961/09-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/46569D53-010D-40FA-B3F0D57D2A58FD14_source.jpg?w=600" alt="Scientific American Magazine Vol 205 Issue 3" srcSet="https://static.scientificamerican.com/sciam/cache/file/46569D53-010D-40FA-B3F0D57D2A58FD14_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="1961-08-01">August 1961</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1961/07-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/3376F401-9E1F-4409-AB4CF69511CCE177_source.jpg?w=600" alt="Scientific American Magazine Vol 205 Issue 1" srcSet="https://static.scientificamerican.com/sciam/cache/file/3376F401-9E1F-4409-AB4CF69511CCE177_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/3376F401-9E1F-4409-AB4CF69511CCE177_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="1961-07-01">July 1961</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1961/06-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/6130334D-1082-4447-AC3E6187BD4F2925_source.jpg?w=600" alt="Scientific American Magazine Vol 204 Issue 6" srcSet="https://static.scientificamerican.com/sciam/cache/file/6130334D-1082-4447-AC3E6187BD4F2925_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/6130334D-1082-4447-AC3E6187BD4F2925_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="1961-06-01">June 1961</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1961/05-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/477BDD24-8536-4EBD-9466EC5312946506_source.jpg?w=600" alt="Scientific American Magazine Vol 204 Issue 5" srcSet="https://static.scientificamerican.com/sciam/cache/file/477BDD24-8536-4EBD-9466EC5312946506_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/477BDD24-8536-4EBD-9466EC5312946506_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="1961-05-01">May 1961</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1961/04-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/03C2AA60-FDA4-4DBD-AB4F683D25247741_source.jpg?w=600" alt="Scientific American Magazine Vol 204 Issue 4" srcSet="https://static.scientificamerican.com/sciam/cache/file/03C2AA60-FDA4-4DBD-AB4F683D25247741_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/03C2AA60-FDA4-4DBD-AB4F683D25247741_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="1961-04-01">April 1961</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1961/03-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" 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class="issue__date-ozuG1"><time dateTime="1960-10-01">October 1960</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1960/09-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/3C462993-C509-492E-B6032CBCEEE3BF2E_source.jpg?w=600" alt="Scientific American Magazine Vol 203 Issue 3" srcSet="https://static.scientificamerican.com/sciam/cache/file/3C462993-C509-492E-B6032CBCEEE3BF2E_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/3C462993-C509-492E-B6032CBCEEE3BF2E_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="1960-09-01">September 1960</time></div></div></div></a></div><div class="list__item--tR3J"><a 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class="issue__date-ozuG1"><time dateTime="1960-02-01">February 1960</time></div></div></div></a></div><div class="list__item--tR3J"><a class="issue__link-3e-qg" href="/issue/sa/1960/01-01/"><div class="issue-VnvuN"><div><div><figure class="issueImageContainer-WnIB2"><img class="issue__cover__image-35p5E" src="https://static.scientificamerican.com/sciam/cache/file/97B1EC45-9DBA-486B-AEA98A0978DD0F42_source.jpg?w=600" alt="Scientific American Magazine Vol 202 Issue 1" srcSet="https://static.scientificamerican.com/sciam/cache/file/97B1EC45-9DBA-486B-AEA98A0978DD0F42_source.jpg?w=300 300w, https://static.scientificamerican.com/sciam/cache/file/97B1EC45-9DBA-486B-AEA98A0978DD0F42_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="1960-01-01">January 1960</time></div></div></div></a></div></div></main><footer 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