 To the sound of applause, Paris Mayor Anne Hidalgo made good on her promise to swim in the River Seine and announced the water is good. $1.5 billion have been spent trying to get the Seine clean enough for the Olympic swimming marathon and triathlon. It's still touch and go. Tests will continue right up to the days of competition. Elaine Cobb, CBS News, Paris. Today in Las Vegas, the mirage will vanish.