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During the day on Aug. 21, large swaths of farmland will be plunged into darkness, and temperatures will drop about 10 degrees. Scientists are waiting to see how crops and animals react. Daniel Acker/Bloomberg/Getty Images hide caption

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Daniel Acker/Bloomberg/Getty Images

Farmer Wendy Johnson markets hogs, chickens, eggs and seasonal turkeys. She also grows organic row crops at Joia Food Farm near Charles City, Iowa. Amy Mayer/Harvest Public Media hide caption

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Amy Mayer/Harvest Public Media

Rogers hand feeds June, a 300-plus-pound pregnant black bear. Derek Montgomery for NPR hide caption

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Derek Montgomery for NPR

Invisibilia: Should Wild Bears Be Feared Or Befriended?

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A blue whale, the largest animal on the planet, engulfs krill off the coast of California. Silverback Films/BBC/Proceedings of the Royal Society B hide caption

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Silverback Films/BBC/Proceedings of the Royal Society B

How The Biggest Animal On Earth Got So Big

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A mother and calf humpback whale swim in the Exmouth Gulf in Western Australia. Fredrik Christiansen/Functional Ecology hide caption

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Fredrik Christiansen/Functional Ecology

Recordings Reveal That Baby Humpback Whales 'Whisper' To Their Mothers

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Say what you will about naked mole-rats, but their bodies have a trick that lets them survive periods of oxygen deprivation. Roland Gockel/Max Delbruck Center for Molecular Medicine hide caption

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Roland Gockel/Max Delbruck Center for Molecular Medicine

Researchers Find Yet Another Reason Why Naked Mole-Rats Are Just Weird

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An Army horse wears a gas mask to guard against German gas attacks. Courtesy of U.S. National Archives hide caption

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Courtesy of U.S. National Archives

The Unsung Equestrian Heroes Of World War I And The Plot To Poison Them

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In a photograph taken Saturday, volunteers prop up a pilot whale at Farewell Spit in New Zealand. Overnight, more than 200 of the stranded whales returned to the sea. Marty Melville/AFP/Getty Images hide caption

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Marty Melville/AFP/Getty Images