The tendency to use one hand (left or right) more naturally and skillfully than the other, or the condition of being left-handed or right-handed.
From 'handed' combined with the noun-forming suffix '-ness.' Scientifically recognized since the 1700s, though the phenomenon has been observed throughout human history.
About 10% of humans are left-handed, and they've been systematically discriminated against for centuries—left-handed children were forced to write with their right hands in schools, yet left-handers show slightly higher average IQs.
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