Here are some additional behind-the-scenes photos of the "Human Spark" nighttime campfire shoot with archaeologist Curtis Marean.

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.

From the discovery of painted caves in Altamira, Spain to the recent discovery of Chauvet in France, what can researchers learn from these ancient artists?