Given a wall, who wins?

Walls guard. Walls constrain. They defy us to break them. And so it has been since the dawn of agriculture. We see defensive walls protecting ancient cities from China through sub-Saharan Africa. Their widespread prevalence is a testment of their desirability.…

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The prisoners' dilemma story

There are too many ways to tell the prisoner’s dillema story. The original is due to Tucker, a version memorialized in a handout dated May 1950, part of which I have transcribed below, as it is so hard to find.…

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