Off-topic, but I cannot resist sharing Peterson's story of how he became interested in decision theory:

A while back a beautiful woman, whom I quite liked, asked me to marry her. I was stunned. Marriage? Now? It is too early! I have not even turned forty! However, for one reason or another I decided not to share my spontaneous reaction with her. I said I felt overwhelmed by this… unexpected proposal, and that I need some time ot think it over. At dawn the following day I… raced to the university library. I borrowed all the books I could find on decision theory. Later the same afternoon, after having learned what modern decision theory is all about, I still had no clue how to answer the lady.

What's the most rational way to remove back hair?

I have plenty of annoying back hair that I need to get rid of. Through monthly calculations, I've found that they grow at an average 1.23 cm/month, and have a tendency to curl into black wisps.

Further Bayesian calculations have shown that the empirical probability of getting noticeable hair in my lower and upper torso is 0.8 and 0.63 respectively during the summer season.

I would like to inquire about the most rational length to which I should trim my back hair (I have a Vernier Caliper and extremely sharp scissors), and the recommended duration between successive trimmings.

I'm sure that the rationalist community here can help me make the most rational choice in back hair removal. As a Bayesian myself, I greatly prefer the use of Occam's Razor, and would appreciate simpler answers.