I would also add in the toolmaker's problem. Rational thinking, like programming, is a tool. When you turn programming on itself, you get metaprogramming and

I would also add in the toolmaker's problem. Rational thinking, like programming, is a tool. When you turn programming on itself, you get metaprogramming and new programming languages. Which is cool for programmers, and many a very skilled programmer has fallen down that rabbit-hole, but neither particularly profitable nor necessarily all that useful. To get the big bucks and make a big -- direct -- difference in the world, you need to combine the tool, programming, with domain knowledge and real-world problems. Likewise, if you turn rational thinking on itself, you get metacognition, thinking about thinking, and rationalists. It's neat, but at the end of the day...