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Mark Adams sent us photos of Machu Picchu in tandem with his first hour appearance on the 5/3/12 show. The full site is pictured on the left, on the right is the enigmatic Intihuatana stone.
Click on images to view larger. More of Mark's photos here.
Annalee Newitz discussed the future of artificial intelligence. Seth Shostak talked about the possibility of other intelligent life in the universe.