Doctors at a hospital in Aleppo, Syria, treat a boy injured in what the government said was a chemical weapons attack on March 19. Syria's government and rebels accused each other of firing a rocket loaded with chemical agents outside of Aleppo. George Ourfalian/Reuters/Landov hide caption

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George Ourfalian/Reuters/Landov

How Doctors Would Know If Syrians Were Hit With Nerve Gas

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Criminologist Believes Violent Behavior Is Biological

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The research of British naturalist Alfred Russel Wallace (1823-1913) played a pivotal role in developing the theory of natural selection. But over time, Charles Darwin became almost universally thought of as the father of evolution. Hulton-Deutsch Collection/Corbis hide caption

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Hulton-Deutsch Collection/Corbis

He Helped Discover Evolution, And Then Became Extinct

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A mammoth spinning vortex is seen on Saturn, in this "false-color" photograph released by NASA Monday. The image was captured by the Cassini spacecraft. A related image, presenting what a human eye would see, is farther down this page. NASA hide caption

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Beekeepers demonstrate at the EU headquarters in Brussels Monday, as lawmakers vote on whether to ban pesticides blamed for killing bees. Georges Gobet/AFP/Getty Images hide caption

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Georges Gobet/AFP/Getty Images
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Big Sibling's Big Influence: Some Behaviors Run In The Family

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A phonorecord by Alexander Graham Bell, one of the Smithsonian's trove of recordings left there by the inventor of the telephone. Richard Strauss/Smithsonian's National Museum of American History Via AP hide caption

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Richard Strauss/Smithsonian's National Museum of American History Via AP

First He Invented The Phone. Then, Bell Left A Voice Message

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The Sounds of Thirsty Trees

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From Coast To Coast with The Power Of The Sun

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A miniature ninja throwing star or a surgical device? The microgripper, shown here coming out of a catheter tube, is activated by body heat. The sharp appendages fold up when the device warms up. Evin Gultepe, Gracias Lab, Johns Hopkins University. hide caption

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Evin Gultepe, Gracias Lab, Johns Hopkins University.

Navy Sonar Criticized For Harming Marine Mammals

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