Why are some people left-handed?


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. [Directed by TED-Ed, narrated by Addison Anderson, music by Michael Dow].

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About agogo22

Director of Manchester School of Samba at http://www.sambaman.org.uk
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