Mid-April marks the anniversaries of several horrendous attacks in recent U.S. history:
-- April 19, 1993: the FBI's siege of the Waco compound leaves 76 dead.-- April 19, 1995: the bombing of a federal building in Oklahoma City kills 168 people.
-- April 20, 1999: A mass shooting at Columbine High School leaves 15 dead.
-- April 16, 2007: The Virginia Tech massacre kills 33.
http://edition.cnn.com/2011/US/04/19/april.attacks.conspiracy/