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Why are only 10 percent of people left-handed?

Abstract:
PHILADELPHIA - Plato and Aristotle puzzled over lefthanders, as did Charles Darwin. What determines "handedness"? Why are only 10 percent of us lefthanded, and why did the ratio seem to change over the last century? Are lefties somehow different - less healthy, more creative?

With brain scanning and the latest genetic technology, scientists are finally starting to crack the mysteries....

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Thomas Anderson

posted 8/16/09 @ 12:11 AM EST

Left-handedness appears to average around 20 percent among autistics, and is also very high among children with dyslexia and other learning problems. Some researchers have linked these problems to perinatal anoxia which suggests that left-handedness too might be a result of "brain damage" at the time of birth. Needless to say, this idea has not been widely accepted -- particularly among lefthanders.
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