View full lesson: http://ed.ted.com/lessons/can-you-solve-the-prisoner-hat-riddle-alex-gendler

Want more? Try the buried treasure riddle: https://www.youtube.com/watch?v=tCeklW2e6_E

You and nine other individuals have been captured by super-intelligent alien overlords. The aliens think humans look quite tasty, but their civilization forbids eating highly logical and cooperative beings. Unfortunately, they’re not sure whether you qualify, so they decide to give you all a test. Can you solve this hat riddle? Alex Gendler shows how.

Lesson by Alex Gendler, animation by Artrake Studio.