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Why Are Left-Handed People Rare?

Relatively few people are lefties, and it's a puzzle why. Still, the science of handedness is revealing fascinating insights about you -- from how it could change the way you think, to the fact that you might be "left-eared." "Left-handers are much more variable in the way that their brains are organized," explains psychologist Chris McManus, from University College London, author of the book Right Hand, Left Hand.
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