We tend to take modern society for granted, yet for nearly all of its 6 million years of existence, human society had none of these things. Even now, says UCLA Professor Jared Diamond, we still possess bodies and social practices often better adapted to traditional conditions.

Town Hall Members get early access! Members-only presale starts on 9/17/12 at 10am! Regular tickets will be available on 9/24/12 at 10am.