I admire Satoshi Kanazawa`s lively intelligence, although I`m not totally persuaded to trust every idea he comes up with. From The Economist:
... less intelligent people are better at doing most things. In the ancestral environment general intelligence was helpfuhelpful only for solving a handful of evolutionarily novel problems.
I look out my window and see mourning doves and crows. The doves seem pretty stupid and the crows appear smarter. Presumably, they both have their evolutionary advantages and disadvantages. Still, it took a lot of natural selection just to get up to being as smart as a dove — try building a robot bird.