Ancient humans learnt to stand upright 7 mn yrs ago, show fossils

Scientists studying the femur and two partial forearm bones of one of the earliest human ancestors, Sahelanthropus tchadensis, recovered in Chad, have found that it may have walked upright seven million years ago. The bones revealed features seen today only in humans. These include a hip-stabilising bone bump and a twisted femur that helps keep knees under body while walking.