by root on documentary
View my bio on PeerTube: https://quebec1.freediverse.com/c/documentary 
Many human species once shared the globe. Why do we alone remain? Becoming Human: Last Human Standing airs Wednesday, August 31, 2011 on PBS. http://www.pbs.org/wgbh/nova/beta/evolution/becoming-human-part-3.html
Watch Part 1 and 2 of Becoming Human in full on our website.