Francis Fukuyama became famous in the 1990's for predicting that the end of the Cold War would mean an era of world peace and an end to global conflicts. Undeterred by that error, in his latest book "Our Posthuman Future" he frets about biotechnology and how it will adversely alter human nature. (For a more positive analysis of the effects of biotechnology and nanotechnology on human nature, take a look at this intriguing debate between Ray Kurzweil and Max More.)