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Forged in 1879 and sanctioned by the General Conference on Weights and Measures at its first meeting, Le Grand K, the international prototype of the kilogram, has been kept under lock and key in a vault outside Paris. BIPM hide caption

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BIPM

Say Au Revoir To That Hunk Of Metal In France That Has Defined The Kilogram

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Scientists find that the whiskers of harbor seals help them distinguish predator from prey — even from a distance. Douglas Klug/Images hide caption

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Douglas Klug/Images

Need To Track A Submarine? A Harbor Seal Can Show You How

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Some physicists are pushing back against ideas like string theory and the multiverse. Here, we see a computer-generated image of a black hole, which might, ultimately, be explained by ideas like string theory. Alain Riazuelo/IAP/UPMC/CNRS hide caption

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Alain Riazuelo/IAP/UPMC/CNRS