【#Tech24H】Approximately 90% of people around the world habitually use their right hand, a remarkably consistent “preference” that is virtually unique. Although scientists have spent decades investigating this phenomenon from perspectives such as brain structure, genetic inheritance, and developmental processes, why the vast majority of humans are right-handed remains one of the most intriguing puzzles in evolutionary history. Now, a joint research team from the University of Oxford and the University of Reading has offered a new perspective to solve this puzzle. The answer is likely tied to two major milestones in human evolution: upright walking and brain expansion. The formation of human right-handed preference can be seen as a “two-step relay” spanning tens of thousands of years. First, upright walking freed the hands, creating a survival advantage for fine, lateralized manual actions. Then, the continuous expansion and reorganization of the brain “locked in” and amplified this tendency, ultimately forging humanity’s nearuniversal preference for the right hand.  [ By Zhang Liyan | Tang Ruohan ]