Why are most people right-handed? Do other primates share this imbalance?

<span>Photograph: Clive Brunskill/Getty Images</span>
Photograph: Clive Brunskill/Getty Images

Why are the majority of people right-handed rather than there being equal numbers of left and right? What is the factor causing the difference and what about other primates – or are we the only species to exhibit this imbalance?

Peter Hanson, Whitestone, Exeter

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