Producer Graham Chedd thought a chat en plein air would add some visual variation from the two-guys-sitting-on-a-couch-type shot that's always easy to get in a professor’s office.

Amanda Henry showed us how she very gently scrapes dental plaque from the Skhul 5 skull’s molars to find out what our ancestors may have eaten.

Harvard's Dan Lieberman argues that we humans evolved to become the best long-distance runners on earth -- and we did it barefoot!

Larry Engel discusses the challenges and joys of filming Alan with the chimps at the North Carolina Zoo.

Watch Tanya Chartrand describe what it was like for her as a scientist to be involved in a television shoot for "The Human Spark."

We’ve just finished shooting at Duke University a series of experiments with Tanya Chartrand on how humans unconsciously mimic each other, and how this makes us more social.

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.

Check out these behind-the-scenes photos from our day filming with Helen Neville and colleagues at the Brain Development Lab at the University of Oregon.