Peer into Alan Alda's head as we uncover where our most human abilities reside. Watch the full episode now.

Alan Alda finds out how human social networks compare to those of chimps and watches babies pick cooperative puppets over those that won't play.

Cognitive psychologist Elizabeth Spelke tests the representational thinking skills of children by asking them to relate a map to the real world.

Alan Alda explores how much humans and chimps have in common, and what sets us apart. Watch the full episode now.

Alan Alda confronts the puzzle of why our ancestors got the Spark and evolved into us, while the first humans to leave Africa for Europe--the Neanderthals--never did.

Scroll through this interactive feature to learn a bit about some of the evidence Alan examined as well as some of the current debates in the field.

Alan Alda, Series Producer Graham Chedd, and Executve Producer Jared Lipworth participated in a live webcast this week, hosted by the National Science Foundation.

Which came first – the running or the brain? Running could be the reason humans were able to hunt large game and consume the protein needed for a big brain.

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

Check out this video to learn more about Lisa Parr's studies on chimp emotions and what these studies can tell us about the human spark.