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.
httpv://www.youtube.com/watch?v=TGLYcYCm2FM
This article originally appeared on Transcend Media Service (TMS) on 5 Oct 2015.
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