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?

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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...

Produced for PBS Digital Studios

Joe Hanson - Host and writer
Joe Nicolosi - Director
Amanda Fox - Producer, Spotzen IncKate Eads - Associate Producer
Katie Graham - Director of Photography
Andrew Matthews - Editing/Motion Graphics
Dalton Allen - Post-production intern
John Knudsen - Gaffer

Theme music:
"Ouroboros" by Kevin MacLeod

Stock images via Shutterstock

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