Left-handedness
The tendency to prefer the left hand for fine motor tasks such as writing or using tools, found in roughly 10 percent of people worldwide.
Even identical twins with the same genes can differ in handedness: one may be left-handed and the other right-handed. Such discordance in twin studies shows that although genes influence handedness, they do not determine it alone.
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About 10% of people worldwide are left-handed. A 2020 meta-analysis covering more than two million people estimated the best overall prevalence at 10.6%—confirming the familiar figure of roughly one person in ten.
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