The wheel turns full circle - but with more sophisticated engineering

Energy Secretary Steven Chu is an accomplished scientist, but he's apparently happy to use low-tech home energy-efficiency tricks, too.
Chu was one of the featured speakers at the opening ceremony of the Solar Decathlon, a contest among 20 colleges to create the best solar-powered home. Student teams from the U.S., Canada, and Europe build homes powered only by solar energy and reconstruct them on the National Mall where they are judged in ten categories and opened to the public for viewing.