Why Are Some People Left-Handed?

Human beings have two perfectly good hands attached to two perfectly good arms controlled by two perfectly capable brain hemispheres, so why do 99% of us prefer to use one over the other when it comes to common tasks?

Several theories have been put forth to explain it, including the development of language, the first apes who learned to throw, a weird genetic side effect of embryonic development, and even a bit of swordplay.

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