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Remote Ready Biology Learning Activities has 50 remote-ready activities, which work for either your classroom or remote teaching.
The Prisoner's Dilemma
My first exposure to the Prisoner's Dilemma was in a computer science class in high school. We had to come up with a strategy for winning the game and then the teacher ran all the strategies against each other to see who ended up with the most points. My strategy was to start out cooperating, but then switch to competing, if the other person did, which actually failed miserably. I didn't understand how to win the Prisoner's Dilemma then, and I still don't. My first instinct is always to cooperate because it gives the greatest return to both players. If you compete, that might give you a larger gain, but only once, and then the other player will wise up and compete too, which is bad for both of you.