Some of the most basic questions about human existence (how did we develop language? why do we love music and art but kill in war? how did we develop certain eating habits? etc.) come back to a more singular question: how are we different from chimpanzees? This question is slowly getting answered by some of today's leading primatologists and evolutionary biologists, including Robert Sapolsky, Daniel Lieberman, Richard Wrangham, Jane Goodall, Steven Pinker, all featured above.