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April 16 2013
They make up a stable fraction of the ppulation, yet their presence is often invisible: left-handers.
Yet despite decades of research, very little is known about why some people are left-handed. Scientists have proposed causes ranging from genes, to damage in utero, to an edge in fistfights to explain why southpaws make up 10 percent of the world's population.
And while there aren't many obvious differences between lefties and righties, southpaws tend to excel at visual and spatial tasks, and seem to be overrepresented amongst geniuses.
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