All our shared values that allow us to cooperate and collaborate lend a “we-ness” to the human species that is certainly lacking in our primate relatives.

Alan Alda learns that what had been believed to be a purposeful burial of a Neanderthal child now isn’t looking like such solid proof of ritualistic behavior.

If you’re a chimp, making friends is straightforward – put in some time grooming your buddy and hopefully you’ll stay on his good side. Not so for humans.

Duke University psychologist Tanya Chartrand enlists Alan as a participant in her research, and shows that subtle mimicry can lead to positive emotions.