According to colleagues of mine at UC Berkeley, studying for the LSAT increases test-takers' IQs. The investigators try to use this to claim that IQ is somewhat plastic. But a few other thoughts occurred to me.
1. Is it really surprising that studying for an intelligence test makes your IQ go up? The dirty little secret of the LSAT is that it has little to do with the law; it seems to me to be a general test of intelligence. Some factors, like reading comprehension, will improve with better schooling. But some, like logic games, are really about intelligence alone. I've always thought the brain is like a muscle - you can be born with a great one, but you have to exercise it to reach its full potential.
2. Let's make everyone study for the LSAT. It would be much better for inner-city kids than their failing schools. I would feel more confident in Kaplan or Princeton Review running a school than the San Francisco School District. It might also help the Yale students who seem to graduate with less knowledge of American history than when they entered as freshmen.
3. I wonder what happens to people who go to law school. Do their IQs go up too? They might go down. On the one hand, they face more rigorous demands on their brain muscle. On the other, it's three more years of liberal academic indoctrination.