From www.hpmor.com/notes/82/:

The Center for Modern Rationality is offering $50 prizes for any suggested rationality training exercises that look good enough to test, and $500 prizes for any suggested exercises that we actually adopt into a unit. Specific descriptions of mental skills, accompanied by the request for exercises to teach them, have been posted for the units Be Specific and Check Consequentialism. (Think of this as trying to invent the actual content of the bizarre exercises that Harry has been inflicting on the Chaos Legion since Ch. 29… oh, wait, I haven’t mentioned those in the text yet, have I?)