Hey man, that's sensitive: Mike Napoli of the Boston Red Sox pulls teammate Jonny Gomes' beard after hitting a three-run homer in Game 4 of the 2013 World Series in St. Louis. Jamie Squire/Getty Images hide caption

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Friend Or Foe? Scientists say dogs react differently to the direction of another dog's tail wag. Time & Life Pictures/Getty Images hide caption

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Workers in protective suits hold dummy munition during a demonstration at a chemical weapons disposal facility in Muenster, Germany, on Wednesday. Philipp Guelland/AFP/Getty Images hide caption

itoggle caption Philipp Guelland/AFP/Getty Images