General Knowledge

The generalists — sources whose whole appeal is that you can’t predict what the next one will be about.

Videos

• CGP Grey (Channel) — 195 videos for 7 million subscribers, on the arbitrary systems humans lay over the world: flags, borders, postal codes, voting methods, coins. He ranked the US state flags and called Minnesota’s the worst; Minnesota redesigned it, and he covered the replacement. Also why runways get repainted, and why a 5¢ nickel costs 14¢ to make.