Chirality describes a state in which something cannot be superimposed on its mirror. It’s often used in chemistry, but the human hand is a good example as well. Chirality is the reason you have to use the same hand as the other person when shaking hands. The “opposite” hand cannot clasp.
This word popped into my head while in the shower this morning. I have no idea why, but there you are.
Unrelated, I started wondering last night if I should have been a doctor, and whether or not becoming one later in life would be remotely feasible. I suspect not. Alas. It’d be nice to help people and get paid for it.