I'm putting another vote for the physics guys. I understand that the QM sequence may be too tangential to be included in a book about rationality, but all of the posts on "philosophy of science" that made MWI obviously true seem worth including.

Since I'm a physics major and my friends are too, the whole "philosophy of science" bit is what I'd loan out the book for (The bit on baye's law occam's razor, belief in the implied invisible, "the map is not the territory", minds as cognitive engines and such)

I guess the "here's what we're trying to do" part seems more interesting than (and should be learned before) the "here's where human minds consistently don't do that" part.