In an interview with Anderson Cooper for 60 Minutes, Olympic champion Michael Phelps points out a mistake made by one of his competitors that enabled him to win his record-tying seventh gold medal. He also gets Anderson in the pool for a little uneven relay competition.  Watch the video above.The interview with Phelps will be broadcast on 60 Minutes this Sunday, Nov. 30, at 7 p.m. ET/PT. ...