From USA TODAY Why are people left-handed? There's no right answer Raise your hand if you're a lefty! Aug. 13 marks the 22nd annual International Left-Handers Day, an event that celebrates the uniqueness of left-handed people. Why are people left-handed? Roughly 10% of the population primarily use their left hand. This happens because the brain is divided into two hemispheres. The right side of the brain controls movement on the left side of the body and vice versa. But why humans develop "handedness," or a preference for one side over the other, is still somewhat a mystery. Because left-handedness tends to run in families, scientists believed for years that handedness was linked to a gene, but could not identify the exact one, according to The New York Times. http://usat.ly/1ouf7Ab Get USA TODAY on your mobile device: http://www.usatoday.com/mobile-apps
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