Lefties historically have had a tendency to get left behind. Until relatively recently, being left-handed was stigmatized, sometimes as an abnormality or sign of weakness. Left-handed children were forced to learn to write with their right hands, often to their significant disadvantage. Of course, we now know that there’s nothing wrong with being left-handed. As University of Toledo psychologist Stephen Christman recently explained in Scientific American, there’s almost no evidence to suggest that lefties are at any sort of physical or psychological disadvantage. For one thing, lefties have comprised roughly 10 percent to 15 percent of the general population for...