Why Are Some People Left-Handed?

SHORT VIDEO CLIPS, 5 Oct 2015

Daniel M. Abrams, TED Ed – TRANSCEND Media Service

Today, about one-tenth of the world’s population is 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.

 

This article originally appeared on Transcend Media Service (TMS) on 5 Oct 2015.

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