Early Apes Walked Upright 15 Million Years Earlier Than Previously Thought, Evolutionary Biologist Argues

Early Apes Walked Upright 15 Million Years Earlier Than Previously Thought, Evolutionary Biologist Argues. http://www.livescience.com/1934-human-ancestors-walked-upright-study-claims.html http://www.plosone.org/article/info:doi/10.1371/journal.pone.0001019http://www.plosone.org/article/fetchObject.action?uri=info%3Adoi%2F10.1371%2Fjournal.pone.0001019&representation=PDF