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Twins, Up; Triplets, Down

NPR's Lynn Neary speaks with FiveThirtyEight.com's number cruncher Mona Chalabi about the number of triplets born in 2012 http://www.npr.org/2014/09/07/346534038/numbers-of-the-week-twins-up-triplets-down #FullNewsAudioAvailable #NPR

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