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

itoggle caption Jamie Squire/Getty Images
Ryan Lash/TED

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

itoggle caption Time & Life Pictures/Getty Images

Cattle crowd inside a feedlot operated by JBS Five Rivers Colorado Beef in Wiley, Colo. John Moore/Getty Images hide caption

itoggle caption John Moore/Getty Images

A test field of sorghum outside Manhattan, Kan., planted by Kansas State University. Dan Charles/NPR hide caption

itoggle caption Dan Charles/NPR

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