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Why are some people left-handed? - Daniel M. Abrams


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Today, about onetenth of the world’s population are southpaws. Why are such a small proportion of people lefthanded 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.

Lesson by Daniel M. Abrams, animation by TEDEd.

posted by emetinav7