Why are some people left-handed?

We’ve got two perfectly good hands attached to two perfectly good arms, so why do most people prefer to use one over the other for common tasks?

David Wolman’s “A Left Hand Turn Around the World” http://amzn.to/1wYqOS2
(lots more references in there!)

Chris McManus’ “Right Hand, Left Hand” http://amzn.to/1umztyL

The best collection of the science of handedness on the internet: Right, Left, Right, Wrong – http://www.rightleftrightwrong.com/in…

Genetic link between handedness and body asymmetry: http://www.plosgenetics.org/article/i…

A gene associated with handedness and schizophrenia: http://www.nature.com/mp/journal/v12/…

Genetic theories of handedness: http://www.rightleftrightwrong.com/th…

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