So says Slate magazine.
http://www.slate.com/id/2147842/"It's well-known that many societies hold lefties in low esteem. In Christian tradition, the devil is generally associated with the left hand; the word sinister comes from the Latin for left, sinistra. Arabs have historically used the right hand for eating and the left for, er, activities at the other end of the alimentary process. More scientifically, left-handedness is related to a number of physiological conditions. Lefties have higher rates of high blood pressure, irritable bowel syndrome, and schizophrenia.
On the other hand, if you'll forgive the inevitable bad pun, left-handedness is also linked with creativity. Leonardo da Vinci was a lefty, as were Michelangelo, Isaac Newton, and Albert Einstein. Psychologists confirm that left-handedness involves different brain function: While right-handed people seem to have better cognitive skills on average, studies find that lefties are more common among the highly talented."
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"The identification of two styles of thinking may help explain why college-educated lefties make more. Psychologist Stanley Coren defines "convergent" thinking as "a fairly focused application of existing knowledge and rules to the task of isolating a single correct answer." "Divergent" thinking, by contrast, "moves outward from conventional knowledge into unexplored association." There may be an outsize number of lefty geniuses because lefties are more likely to engage in divergent thinking. In an experiment in which subjects devised uses for pairs of common objects, such as imagining that a stick and a can could together be a birdhouse, lefties on average came up with nearly 30 percent more uses."