What causes some people to be left-handed, and why are fewer people left- handed than right-handed?

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What are proven facts about left-handed people? - Quora

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A large-scale population study of early life factors influencing left- handedness

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Bias against left-handed people - Wikipedia

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If you're right-handed, what are some of the things that you do

What are proven facts about left-handed people? - Quora

My wife and I are left handed. Will our son be left handed as well

Why is it that when a right-handed person uses left-handed scissors, they don't cut but the motion is the same? And this is true of left- handed people and right handed scissors