Any of the futures I have just sketched might happen, but not all. If nanotech turns the world into gray goo in 2030, it will also turn into gray goo the computers on which artificial super intelligences would have been developed in 2040. If nanotech bogs down and A.I. does not, the programmed computers that rule the world of 2040 may be more interested in their own views of how the human species should evolve than in our view of what sort of children we want to have. And, closer to home, if strong private encryption is built into our communication systems, with the encryption and decryption under the control not of the network but of the individuals communicating with each other–the National Security Agency's nightmare for the past twenty years or so–it won't matter how many telephone lines the FBI can tap.