Thursday, 21 April 2016

'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.

After watching the video try the test to know how much you have learnt.

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