Today is the official beginning of the 2012 London Summer Olympics.  The summer Olympics happen only once every four years.  This summer's Olympics will run from July 27 through August 12 in London, England.  Coverage of the opening ceremonies begins tonight (Friday) at 6:30 p.m.  For complete information on all the different Olympic events and schedules, visit http://www.london2012.com/.  It's sure to be an exciting couple of weeks of Olympic competition.  As some of the world's greatest athletes compete for Olympic gold, the whole world will be watching.  Will you?