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Why are some people left handed?

TedEd

Left handers day is the 13th August: 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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Why are some people left handed?

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