I just finished DNA USA: A Genetic Portrait of America by Bryan Sykes and have started on the prequel, The Seven Daughters of Eve. Seven Daughters was published in 2002, which is like five decades in science years, but still wonderful and fascinating to read. I can't look at my Mexican friend now without envisioning his painted gene map...there must be lots of "orange" in it. You'll have to read DNA USA to find out what that means. It's worth it!