Once a year, the theoretical chemist Peter Schuster took his students from the University of Vienna to a small house in the Austrian mountains. During the day we skied, of course, but in the evening the emphasis was on science. I was a first-year PhD student looking for a project. The math-ematician Karl Sigmund was there and gave a talk on what was a new topic for him: the prisoner's dilemma. At the end of the talk I asked a question, and the next day Karl and I travelled back to Vienna, endlessly debating this game. In subsequent days, I visited his office and we started to do calculations. We had become prisoners of the dilemma.
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