[Question] What are good rationality exercises?

I want to know what are good rationality exercises.

I was just on a call with Liron and PhilH, hanging out after the weekly LessWrong weekend event, and we discussed exercises that could happen on LessWrong.

Here is the list we generated:

  • Thinking Physics

  • Fermi Estimates

  • Project Euler

  • Calibration Training

  • Basic probabilistic reasoning

  • Basic have-you-read-the-sequences knowledge test (e.g. “Which of the following is an example of ‘belief as attire’?”)

Another user on the call (whose name I forget) suggested it could be fun to have a daily Fermi Estimate on LessWrong, where everyone submits their number and the model they used to reach the number. I think this would be quite exciting.

Please write answers with other exercises that you think are or might be great for rationality training, some explanation of why you think it could be good, and a suggestion of how it could be incorporated into LessWrong. I’ll probably add some of the above myself.