I do teach swimming; I did for many years as a job, and now I do it for fun (and for free) to the kids of my friends (and several of the CFAR staff when I was in San Francisco). It's something I'm very good at (I may be more at teaching swimming to others than swimming myself), and it fulfills an urge, but not the idea-spreading one.

If CFAR is looking for help trying to make a rationality test, I would be happy to help, too...