Currently about 8 percent of people are left handed. Have levels of left-handedness always been this low or is right hand dominance a recent trend? In the Middle Ages left-handedness was a "sinister" sign, indicating that you were marked by the devil. Before machinery I can't see any advantage to conforming to a societal norm for handedness. We live in a left-brain dominated world which might help explain why there are so many righties out there.
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