Two Ancient Clues May Finally Explain Why 90% of Us Are Right-Handed

A new primate study suggests human right-handedness has deep evolutionary roots, emerging early in hominin history.

Researchers found the strongest links to hand preference were brain size and limb proportions, not just species differences.

The model indicates right-handedness likely became more pronounced in later Homo species and may also have been present in Neanderthals.

The findings help explain why right-hand dominance is so widespread in modern human populations.