Olympic Gymnast Shawn Johnson Sadly Retires Just Four Days Short of U.S. Championship

Olympic gold medalist Shawn Johnson was forced to retire at the tender age of 20, putting an end to her bid to make the 2012 U.S. Olympic Gymnastics team after suffering one too many setbacks from a knee she injured during a 2010 skiing accident. She told the AP, in so many words, that, although she's a world-class… »6/03/12 5:30pm6/03/12 5:30pm