This young female rhinoceros, photographed in Kenya in 2011, was killed by ivory poachers a few months after this photo was taken. Courtesy of Tom Snitch hide caption

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Artistic reconstruction of Archicebus achilles in its natural habitat of trees. Xijun Ni/Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences hide caption

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Nom Nom Nom: From left, a cast of teeth from a chimpanzee, Australopithecus afarensis and a modern human. We switched from an ape-like diet of fruits and leaves about 3.5 million years ago, according to fresh research. There's evidence that meat-eating came about a million years or so later. William Kimbel/Institute of Human Origins hide caption

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Channel-billed toucans are important seed dispersers in rain forests. Courtesy of Lindolfo Souto/AAAS/Science hide caption

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Colonists built the original glass-blowing kiln in Jamestown, Va., at this beach for easy access to the sand. Now the site is just inches above the water level. John W. Poole/NPR hide caption

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The four cuts at the top of this skull "are clear chops to the forehead," says Smithsonian forensic anthropologist Douglas Owsley. Based on forensic evidence, researchers think the blows were made after the person died. Donald E. Hurlbert/Smithsonian hide caption

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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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Wind turbines at the San Gorgonio Pass Wind Farm in Whitewater, Calif., in 2012. Bloomberg via Getty Images hide caption

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Thousands of "fairy circles" dot the landscape of the NamibRand Nature Reserve in Namibia. Why these barren circles appear in grassland areas has puzzled scientists for years. N. Juergens/AAAS/Science hide caption

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This photo from a Kyodo News helicopter shows a flame of natural gas from a Japanese deep-sea drilling ship on Tuesday. This successful extraction of methane from the seafloor was a world first. Kyodo/Landov hide caption

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Scientists say they have put together a record of global temperatures dating back to the end of the last ice age, about 11,000 years ago. This historical artwork of the last ice age was made by Swiss geologist and naturalist Oswald Heer. Oswald Heer/Science Source hide caption

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In this Sept. 1, 2008, photo released by Wildlife Conservation Society, a male forest elephant strides across Langoue Bai, Gabon. Elizabeth M. Rogers/Wildlife Conservation Society via AP hide caption

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