Why Most Humans Are Right-Handed
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Summary
While most mammals show an even 50-50 split between left- and right-side dominance, humans are unique: roughly 90 percent of the global population is right-handed. According to the Journal of Human Evolution, anthropologists attribute this strong bias to the co-evolution of language and manual dexterity in the brain's left hemisphere. Because the left hemisphere controls fine motor skills on the right side of the body, tool use developed primarily in the right hand. Social cooperation further reinforced this tendency, as sharing tools and coordinating tasks worked best when everyone used the same dominant hand. However, natural selection never completely erased left-handedness from the gene pool. According to evolutionary research published by the Royal Society, a left-handed minority survived because it provided an unexpected advantage in physical combat. In face-to-face fighting, right-handed opponents were unfamiliar with defending against strikes coming from the left. This strategic benefit kept left-handedness stable at roughly 10 percent of the population over thousands of years. Human handedness ultimately reflects an evolutionary balance between social cooperation and individual competition.
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