Bianca Giaever for NPR

A newly discovered neural circuit in the brain of the common fruit fly seems to serve as a sort of "volume control," turning up and down the perception of sound and light. Nicholas Monu/iStockphoto hide caption

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Would time spent with Anton Chekov, famed for his subtle, flawed characters, make you a better judge of human nature? Hulton Archive/Getty Images hide caption

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