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Science  24 May 2013:
Vol. 340, Issue 6135, pp. 906-907
DOI: 10.1126/science.340.6135.906-c

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Summary

Scientists have now confirmed a long-held suspicion: Penguins prefer to swim because being both a diver and a flyer is costly and inefficient. And researchers have determined that French King Louis XVI carried genetic risk factors for diabetes, obesity, and bipolar disorder.