Oklahoma City Bombing

BOSTON, MA - APRIL 15:  A man is loaded into an ambulance after he was injured by one of two bombs exploded during the 117th Boston Marathon near Copley Square on April 15, 2013 in Boston, Massachusetts. Two people are confirmed dead and at least 23 injured after two explosions went off near the finish line to the marathon.  (Photo by Jim Rogash/Getty Images)

Mid-April Linked With National Tragedy

The deadly attacks in Boston Monday left a city and a nation searching for answers. But it has also drawn attention to an odd historical phenomenon that happens around this time of April.

CBS Miami–04/16/2013

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