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Why Are Some People Left-handed?

Video   Aug 13, 2019 | Taken from TED-Ed

 

Today, about one-tenth of the world’s population are southpaws. Why are such a small proportion of people left-handed -- and why does the trait exist in the first place? Daniel M. Abrams investigates how the uneven ratio of lefties and righties gives insight into a balance between competitive and cooperative pressures on human evolution.

 
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