US has five percent of world's population, but had 31 percent of its public mass shooters from 1966-2012 - discu.eu

Reddit

US has five percent of world's population, but had 31 percent of its public mass shooters from 1966-2012 http://phys.org/news/2015-08-percent-world-population-mass-shooters.html 4 comments 23/8/2015 politics