By BY KENNETH CHANG from NYT Science https://ift.tt/2KHnJ5Y
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By Ana Ionova and Tanira Lebedeff from NYT World https://ift.tt/2Q01zvW
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By Unknown Author from NYT U.S. https://ift.tt/c7FmgTE
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By Mattathias Schwartz from NYT U.S. https://ift.tt/WB8fdV3
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