I am one of the 10 percent of the population that is left-handed. According to this WSJ article there are several risks to having your left hand be your dominant one. The article also talks about the condition of mixed-handedness, of which I also have some attributes. One interesting note that the article posits is that "one reason that not more is known about lefties is that many studies of how the brain works prohibit left-handers from participating because their brain wiring is known to be different." Well, that certainly is a bit unfortunate and not entirely helpful. Anyway, the article is interesting for us who have the good fortune to be lefties.