HumansHuman ancestors may have walked on two legs 7 million years ago An analysis of thigh and forearm bones from Sahelanthropus tchadensis suggests the early hominin was mainly bipedal, but the claim is controversial News
HumansPeople instinctively run at their most energy-efficient speed Findings from people running in the lab and in the real world show that men and women tend to run at a speed that minimises energetic costs, though men run faster News