There is probably never a good time to ask the question--Tell me, do you consider yourself insane?--but when the time comes, Ted Kaczynski responds without hesitation. "I'm confident that I'm sane, personally," he says. "I don't get delusions and so on and so forth...I mean, I had very serious problems with social adjustment in adolescence, and a lot of people would call this a sickness. But it would have to be distinguished between an organic illness, like schizophrenia or something like that."
He is sitting on a concrete stool in a concrete booth with windows made of reinforced glass. When he...