00471nam a2200085Ia 4500008004100000245001900041300026200060650001300322856005000335170517s9999    xx            000 0 und d  aWhat is Human?  aThis episode of National Geographic's Naked Science series examines one of humanity's greatest unanswered questions - when exactly was the transitional moment in our evolutionary history in which we became men? Experts examine the fossils of three of our...  xScience.  uhttp://topdocumentaryfilms.com/what-is-human/