Oxford study links right-handedness to bipedalism and brain growth in human evolution

Across every culture and continent, roughly nine in ten humans reach instinctively with the same hand — a quiet uniformity that science has long struggled to explain. A team at Oxford University now traces this ancient asymmetry to the moment our ancestors rose onto two legs: freed from the demands of locomotion, hands became instruments of precision, and the brain reorganized itself accordingly. What feels like a personal trait turns out to be a signature written into our neurology over millions of years of evolution.