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The body of killed Russian opposition leader and former Deputy Prime Minister Boris Nemtsov, covered by plastic, seen on Bolshoi Moskvoretsky bridge near St. Basil cathedral, Moscow, Russia, February 28, 2015. (Stringer/Anadolu Agency/Getty Images)

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Ryan Milligan tends to the plants he grows at the Greenwekrs facility for sale to medical marijuana dispensaries in Denver, Colorado, on August 3, 2011. (Randall Benton/Sacramento Bee/MCT via Getty Images)