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An artist's concept shows a NASA Mars exploration rover on the surface of Mars. The twin rovers Spirit and Opportunity were launched in 2003 and arrived at sites on Mars in January 2004. NASA/JPL-Caltech hide caption

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NASA/JPL-Caltech

Opinion: Good Night Oppy, A Farewell To NASA's Mars Rover

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Talkin' Birds: The Great Backyard Bird Count

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Thanks in part to his original songwriting, singing and guitar-playing, Physics doctoral student Pramodh Senarath Yapa beat out the remaining entrants to win this year's "Dance Your Ph.D." contest. Courtesy of Matthias Le Dall hide caption

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Courtesy of Matthias Le Dall

Ph.D. Student Breaks Down Electron Physics Into A Swinging Musical

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Andreas Ekstrom on the TED stage. TED hide caption

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TED

Andreas Ekström: Can We Solve For Bias In Tech?

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J. Marshall Shepherd on the TED stage. TED hide caption

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TED

J. Marshall Shepherd: How Does Bias Shape Our Perceptions About Science?

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Dramatic decreases in deaths from lung cancer among African-Americans were particularly notable, according to the American Cancer Society. Siri Stafford/Getty Images hide caption

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Siri Stafford/Getty Images

Scientists around the world criticized Chinese researcher He Jiankui's experimental editing of DNA in embryos that became twin girls. Anthony Wallace/AFP/Getty Images hide caption

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Anthony Wallace/AFP/Getty Images

In 2011, a 17-year-old named Mishka told readers of his Facebook post that his Salem, Ore., high school was "asking for a f***ing shooting." That post and other furious outbursts triggered a quick, but deep evaluation by the school district's threat assessment unit. Beth Nakamura for NPR hide caption

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Beth Nakamura for NPR

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A white-tailed deer keeps its ears open while grazing in South Hero, Vt. Rob Swanson/AP hide caption

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Rob Swanson/AP

Hungry Deer May Be Changing How Things Sound In The Forest

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Scientists have isolated a molecule with disease-fighting potential in a microbe living on a type of fungus-farming ant (genus Cyphomyrmex). The microbe kills off other hostile microbes attacking the ants' fungus, a food source. Courtesy of Alexander Wild/University of Wisconsin hide caption

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Courtesy of Alexander Wild/University of Wisconsin

Images of the object nicknamed Ultima Thule photographed from the New Horizons spacecraft on Jan. 1. NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute/Getty Images hide caption

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NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute/Getty Images

NASA Will Make A Last Attempt To Contact Mars Rover Opportunity

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A researcher examines the underwater hull of the USS Hornet CV-8, which played a role in several key events of World War II. Photo courtesy of Paul G. Allen's Vulcan Inc hide caption

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Photo courtesy of Paul G. Allen's Vulcan Inc