This evening I've been discussing stuff with much more learned people.
Stuff like why the pendulum effect apparently disappears when you bank a high-wing aircraft through a balanced turn and the relationship between centripetal force and gravity, together with leverage ratios.
All useless, silly and interesting stuff.
I also realised on the way to Tesco that I'd got one crucial part of an argument I put forward wrong. It'll be interesting to see if anyone notices or whether I have to confess.