Carl Zimmer has a really nice writeup on this, http://phenomena.nationalgeographic.com/2013/05/07/charlemagnes-dna-and-our-universal-royalty/ http://phenomena.n

Carl Zimmer has a really nice writeup on this, http://phenomena.nationalgeographic.com/2013/05/07/charlemagnes-dna-and-our-universal-royalty/ http://phenomena.nationalgeographic.com/2013/05/07/charlemag... , where he discusses Chang's result and Peter Ralph and I's paper on this topic http://www.plosbiology.org/article/info%3Adoi%2F10.1371%2Fjournal.pbio.1001555 http://www.plosbiology.org/article/info%3Adoi%2F10.1371%2Fjo...