Study links right-handedness bias in humans to walking on 2 legs

A team led by Oxford researchers found the reason almost 90% of human population is right-handed lies in the fact that we walk on two legs. In four‑legged primates, the hands are busy helping with movement, so there is less freedom for one hand to specialise. Further, brain expansion strengthened left-right brain specialisation, together producing a population‑level bias towards right‑handedness.