In Arizona, Alan and archeologist Curtis Marean had a fireside chat about how modern humans replaced the Neanderthals. Check out this video to see how the scene was made.

One of Scott’s most important responsibilities is making sure that nothing that can react with a magnet gets anywhere near the MRI machine. Watch this interview.

Alan Alda gives an introduction to "The Human Spark," a new series that explores the question, "What makes us human?"