How to assess the future, especially the tricky futures of science and technology has long been the job of Daniel Gerstein, who has tried to assess coming threats and opportunities for both the Defense Department and the Department of Homeland Security.  Gerstein spells out his operating principles and how he makes them work in his new book The Story of Technology: How We Got Here and What the Future Holds. Among other revelations – what’s different and what’s the same about science and technology?