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

Daniel M. Abrams | TED-Ed

View full lesson: http://ed.ted.com/lessons/why-are-som…

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.

Lesson by Daniel M. Abrams.

Animation by TED-Ed.