4) Giving up freedom for security has begun to look naive. Even to me. Many of you were ahead of me on this — Three out of four hijacked airplanes destroyed the World Trade Center and a piece of the Pentagon in 2001. How is it possible that those planes were taken using only five perps armed with knives? It was possible because all those hundreds of passengers had been carefully stripped of every possible weapon. We may want to reconsider this approach. It doesn't work in high schools either.

Here is where the predictions failed: We didn't take Cargo Cult mentality into account: "if somebody has something I don't, he must have stolen it." We didn't understand how good we could get at communication — when you have something that someone else doesn't, the whole damn planet knows it.

Cheap superconductors imply maglev trains everywhere. Computers could get big again, with RAM/ROM rising by powers of forty and fifty, if superconductors shed the heat. Laser handguns against superconducting armor. I'm not predicting; I just love playing with superconductors.