"One hundred green-eyed logicians have been imprisoned on an island by a mad dictator. Their only hope for freedom lies in the answer to one famously difficult logic puzzle. Can you solve it? Alex Gendler walks us through this green-eyed riddle."

http://feeds.boingboing.net/~r/boingboing/iBag/~3/DrfVOEpm61Y/the-famously-difficult-green-e.html