I've learned two things in two days which might be some kind of record. In medieval times, nobles retained the right to wage war on their own behalf, without regard to their nation (a concept that barely existed). This was known as the right of feud, and hence, the feudal system.
This hasn't been proven yet, but every even number, as far as the scientists know, is the sum of two prime numbers. I've proved it to my own satisfaction as far as ten.