HANDEDNESS: Apparently chimps have a preference for one hand or the other, according to this item from Discover. Actually all primates do, and the proportions vary by species (lemurs are mostly lefties, humans are mostly righties). But here's the kicker: "Among humans, lefties are more likely than righties to suffer from dyslexia, schizophrenia, stuttering, and other disorders." This explains....a little too much for my tastes.....