Five super-sized Olympic rings were lowered off Tower Bridge in London on Wednesday.  The fusing of a London icon — the gateway to the city — with the rings is a signal that London is prepped for the games with only one month to go.  The games start July 27 and end on Aug. 12.  The massive rings (82 feet) wide and (37 feet) tall are part of efforts to bedeck the city in Olympic banners and bold color ahead of the competition.