Did Leonardo DaVinci use his own shadow to create the outline of Jesus in The Last Supper? James Williams speaks with a researcher who has found evidence in Leonardo's manuscripts suggesting that's the case.
Just below the Swiss Alps sits a 3000 square foot house framed almost entirely in glass. This European beauty was one of the first zero-emissions homes in Europe.
Making historic houses energy efficient can pose quite a few challenges because they're old and drafty. Steve finds out quickly that the Degas house has no insulation and something has to be done, but it must be green.