There are a lot of lectures at the University of Chicago. That means some of them don't have as many people in the audience as you might expect, which can be a little embarrassing. But the Ian Hacking lecture yesterday, called "The Suicide Weapon", was a big draw. It filled Social Science 122 to capacity, with people sitting on the floor on both sides of the room, and some students in the windows. After the lecture some students just climbed out of the windows rather than leaving through the doors.