I once learned that if you live near a creek, and your grandfather takes you for a walk in the woods. When you are inevitably separated from him, and lost in the wilderness, you can follow the current home.
I learned from Bear Grylls that you should follow a waterway downstream and you will eventually reach civilization, though that rule does not apply in Africa.
I learned that when Socrates visited the oracle at Delphi he said "The only thing I know for certain is that I know nothing", and the oracle was all like, mouth agape, "Wisdom".
I learned US President Harry Truman fell in love with his future wife Bess in Sunday School when he was 6 years old and she was 5. He never loved another woman.
I learned White Phosphorus can only be called upon to use against equipment and not personnel in order to be in lawful compliance with the Geneva Conventions.
Just to set everyone's mind at ease, no equipment was injured prior to this discovery.