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Nora Keegan, then in the fifth grade, presents her research findings in 2016. Courtesy of the Keegan family hide caption

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Courtesy of the Keegan family

13-Year-Old Scientist's Research Shows Hand Dryers Can Hurt Kids' Ears

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Researchers at Johns Hopkins University have launched a free online gun violence prevention course. Elizabeth Fernandez/Getty Images hide caption

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Elizabeth Fernandez/Getty Images

Free Gun Violence Prevention Course Launches To Educate Young Activists

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The image on the left shows the brains of pigs that were untreated for 10 hours after death, with neurons appearing as green, astrocytes as red and cell nuclei as blue. The image on the right shows cells in the same area of brains that, four hours after death, were hooked up to a system that the Yale University researchers call BrainEx. Stefano G. Daniele and Zvonimir Vrselja, Sestan Laboratory, Yale School of Medicine hide caption

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Stefano G. Daniele and Zvonimir Vrselja, Sestan Laboratory, Yale School of Medicine

Scientists Restore Some Function In The Brains Of Dead Pigs

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Skeletal muscle cells from a rabbit were stained with fluorescent markers to highlight cell nuclei (blue) and proteins in the cytoskeleton (red and green). Daniel Schroen, Cell Applications Inc./Science Source hide caption

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Daniel Schroen, Cell Applications Inc./Science Source

The reasons for why Americans and Canadians choose to tweet differently is difficult to determine. Cameron Pollack/NPR hide caption

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Cameron Pollack/NPR

Study Shows Americans Are Meaner On Twitter Than Canadians

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People who are sensitive to the bitterness of caffeine tend to drink more coffee than others, while people sensitive to bitter flavors like quinine drink less coffee, according to a new study. Dimitri Otis/Getty Images hide caption

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Dimitri Otis/Getty Images

A 291-day-old retina. Our ability to see colors develops in the womb. Now scientists have replicated that process, which could help accelerate efforts to cure colorblindness and lead to new treatments for diseases. Johns Hopkins University hide caption

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Johns Hopkins University

Human Retinas Grown In A Dish Reveal Origin Of Color Vision

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The New England Aquarium team searching for right whales, at sunrise in the Bay of Fundy. Johanna Anderson and Kelsey Howe scan the waters while Marianna Hagbloom logs data, Amy Knowlton adjusts a GPS unit, and Brigid McKenna steers the Nereid. Murray Carpenter for NPR hide caption

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Murray Carpenter for NPR

In Changing Climate, Endangered Right Whales Find New Feeding Grounds

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Immature human eggs (pink) were created by Japanese researchers using stem cells that were derived from blood cells. Courtesy of Saitou Lab hide caption

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Courtesy of Saitou Lab

Scientists Create Immature Human Eggs From Stem Cells

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Microplastics found along Lake Ontario by Rochman's team Chris Joyce/NPR hide caption

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Chris Joyce/NPR

Beer, Drinking Water And Fish: Tiny Plastic Is Everywhere

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Flaws in a study of the Mediterranean diet led to a softening of its conclusions about health benefits. But don't switch to a diet of cotton candy just yet. Westend61/Getty Images hide caption

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Westend61/Getty Images