Prof. Daniel Lieberman at the Massachusetts General Hospital, Boston, MA:
P.S. If you ever have the opportunity to hear Prof. Lieberman speak, take it. I posted this before listening, and I am in the middle of listening to it now. This is a terrific discussion about the evidence for barefoot running, and what the actual benefits may be. The audience is a bunch of doctors, so he's being quite specific and careful in his argument; it's fascinating.