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- From: Khan Academy Math Group
- Contributed By: Sal Khan
This video sets up and explains the classic brain teaser involving two people: one who always lies and one who always tells the truth.
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This video sets up and explains a brain teaser which involves four people who alternate between lying and telling the truth and one person who always tells the truth.
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This video sets up and explains a brain teaser in which ten people in a line need to guess what color hat they are wearing.
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This video sets up a problem in which 100 logicians sit in a room where at least one of them has their forehead painted blue and if any of them deduces that their own forehead is blue they must leave the room.
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This video has the solution to the Blue Forehead Room problem.
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This video sets up and explains another brain teaser in which more logicians have numbers written on their foreheads.
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This video sets up and explains a problem involving 100 light bulbs being turned on and off on various passes.
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This video sets up and explains a brain teaser in which you must navigate unique paths through a six by six grid.
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This video sets up and explains a problem in which you must navigate unique paths through a three dimensional cube.
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