People shoot their guns at a shooting range near the Crossroads of the West Gun Show in Tucson, Ariz., on Jan. 15. Kevork Djansezian/Getty Images hide caption

itoggle caption Kevork Djansezian/Getty Images

An Egyptian army soldier tries to stop anti-government protesters as they walk toward Tahrir Square in Cairo on Sunday. Emilio Morenatti/AP hide caption

itoggle caption Emilio Morenatti/AP