The Hardest Logic Puzzle Ever...

There's a classic logic puzzle in which a person m...  ...mine which path is the safe one. Mathematician Raymond Smullyan has added another dimension to this puzzle. See...  ...annot remember. Link via Marginal Revolution | Raymond Smullyan UPDATE 3/18/10: Here's the solution.

http://www.neatorama.com/2010/03/17/the-hardest-logic-puzzle-ever/