The claims that Peter McAllister makes are, uh, not necessarily 100% "true." For a more well-reasoned and accurate analysis, see this post by anthropologist John Hawks:http://johnhawks.net/weblog/topics/energetics/modern-man-wimp-mcallister-2009.html Abusive comment hidden. (Show it anyway.)
http://johnhawks.net/weblog/topics/energetics/modern-man-wimp-mcallister-2009.html