Handguns collected in South-Central Los Angeles as part of a Gun for Gift Card exchange in 2009. One teenager here says getting a gun on the streets is just "one phone call away." Mark Ralston/AFP/Getty Images hide caption

itoggle caption Mark Ralston/AFP/Getty Images

Competitors in a men's category race in the 2013 National Cyclo-cross Championships in Bradford, England, this month. The sport requires riders to traverse mud and sand on off-road courses peppered with obstacles. Oli Scarff/Getty Images hide caption

itoggle caption Oli Scarff/Getty Images

Law enforcement personnel near the scene of the standoff in Midland City, Ala., where a man is said to be holding a 5-year-old boy hostage in an underground bunker after killing a school bus driver. Philip Sears /Reuters /Landov hide caption

itoggle caption Philip Sears /Reuters /Landov

Hadiya Pendleton. Courtesy of Pendleton family via the Chicago Tribune /MCT /Landov hide caption

itoggle caption Courtesy of Pendleton family via the Chicago Tribune /MCT /Landov