The Sunday Times describes how Mohammed Atef was killed in a U.S. attack.

I found a Google search in my referrer log this morning from someone looking for stuff on the Prisoners' Dilemma in relation to the World Trade Center. That got me curious what he might have been looking for. The closest thing I could find was an 1998 essay from a University of Michigan international affairs student that applies the Prisoners' Dilemma to the choice of a response to terrorism to show that tit-for-tat is the only way to be successful. Axelrod and Hamilton showed this strategy had the best payoff in a 1981 paper in Science: The Evolution of Cooperation. Björn Brembs' article in Oikos discusses different strategies for the game, some of which can be simulated online, and gives examples of applications in nature. It's a shame that real life is not as straightforward as game theory.