I’m entertained at the notion of Diamond’s book refuting an idea popularized by Feynman. I’m convinced that they both make shit up. Feynman’s book wasn’t written by Feynman, but by a guy who heard Feynman’s stories years before, and Diamond’s book Guns Germs and Steel references many “facts” with zero citations that on further inspection turn out to be unsupported. Bullshit artist vs bullshit artist, basically.