Pyroengineering. A big word for what early modern humans learned to do with silcrete at least 72,000 years ago, according to researchers.

We took a look inside Alan's brain using an MRI machine. Apparently he has quite a plump hippocampus.

Dan Gilbert and Alan Alda discuss whether animals have the ability to "prospect," or plan ahead.

A Web site called Test My Brain lets you participate in online experiments and get feedback about how you compare to other online participants.

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.

The media has jumped all over this beautifully preserved 47-million-year-old fossil, with some even calling it a “missing link.” What do you think?

Harvard's Marc Hauser has coined his own term for what we’ve been calling the Human Spark – humaniqueness.

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!

The colors a species can perceive is dictated by the types and number of visual pigments found in the retina. How might our color vision system have evolved?