Terrorism by foreign and domestic perpetrators happens in the U.S. and elsewhere around the globe at various times throughout the year. The 9/11 attacks occurred in the fall. Shoe bomber Richard Reid tried to blow up a plane in December 2001. The 1996 Olympic bombing in Atlanta happened in the middle of summer. In the U.S., more mass shootings have taken place in November (11) than April (10) since 1980. In 2012, for example, the shootings in Newtown, Conn. (December) and Aurora, Colo. (July) happened at other times of the year [sources: Pappas, Follman]. … [Read more...] about Is April the Most Violent Month?