Kanazawa has a "Savanna principle" hypothesis which speculates that societal problems are due to the human brain supposedly evolving in [[Africa]] hundreds of thousands of years ago in a very different environment from modern society.<ref>http://www.psychologytoday.com/node/38933</ref> | Kanazawa has a "Savanna principle" hypothesis which speculates that societal problems are due to the human brain supposedly evolving in [[Africa]] hundreds of thousands of years ago in a very different environment from modern society.<ref>http://www.psychologytoday.com/node/38933</ref> |