Firstly, thanks to Richard Nikoley for posting links to a couple of lectures by the above Stanford Professor. I've watched three of Sapolsky's lectures so far and they've all been very interesting. Here are links to five of them.
The Uniqueness of Humans (37 mins)
Depression (52 mins)
Stress, Neurodegeneration and Individual Differences (1 hour 19 mins)
Toxoplasmosis (37 mins)
The Origin of Religion (9 mins + 10 mins)
I may be gone some time.