9/27: Drought slowing economic growth; did da Vinci paint 2 Mona Lisas?

      |The Commerce Department has put out a new report showing economic growth was less than previously thought during the second quarter of 2012. As Anthony Mason reports, the government says much of the downward revision can be blamed on the drought; And, the most famous work of art in the world - the Mona Lisa - is one of a kind. Or is it? Art experts in Switzerland say they have proof Leonardo da Vinci painted another portrait of the same woman. Mark Phillips looks into this claim that has shaken the art world.

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