U.S. mass shootings: 'The dark side of American exceptionalism'
Why does the United States lead the world in mass shootings? A study suggests unprecedented gun ownership, unhealthy obsession with fame and failure to achieve the "American dream" lead to mass violence. (Dylan Stableford/Yahoo News)
See FULL STORY by Dylan Stableford/Yahoo News
Find more news-related pictures in our photo galleries and follow us on Tumblr.