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Scientists find a clue to human brain evolution in finger length

2026-02-10 09:42
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Scientists find a clue to human brain evolution in finger length

Human evolution has long been tied to growing brain size, and new research suggests prenatal hormones may have played a surprising role. By studying the relative lengths of index and ring fingers — a ...

Human evolution has long been tied to growing brain size, and new research suggests prenatal hormones may have played a surprising role. By studying the relative lengths of index and ring fingers — a clue to oestrogen and testosterone exposure in the womb — researchers found that higher prenatal estrogen was linked to larger head size in newborn boys.