Por que os humanos são inteligentes?

Na editoria de ciência do New York Times de hoje: "Lots of Animals Learn, but Smarter Isn't Better". O texto começa assim: "Why are humans so smart?" is a question that fascinates scientists. Tadeusz Kawecki, an evolutionary biologist at the University of Fribourg, likes to turn around the question. "If it's so great to be smart," Dr. Kawecki asks, "why have most animals remained dumb?".