Ten Alien Abductees in Hats

You may remember the puzzles about prisoners in hats. Here's a puzzle that places people in the same type of situation, except there are now ten people, and they’ve been abducted by aliens. This time, they don’t know how many hats are black or white, but they get a chance to work out a strategy before they are lined up. Alex Gendler presents a TED-Ed lesson on how the abductees could work it out -if they are intelligent enough. See, not only does someone have to figure out how to do it, the others must be able to follow simple instructions, and it’s hard to find ten people who can do that. (via mental_floss)