Leg evolution made most humans right-handed

'Rightie' preference isn't seen in any of our primate relatives. More information Adding us as a Preferred Source in Google by using this link indicates that you would like to see more of our content in Google News results. Most of our primate relatives are a mix of right-and left-handed. Breakthroughs, discoveries, and DIY tips sent six days a week. It would make more sense if only a few related cultures exhibited it, but the trait is everywhere.