Blue Eyes

Explain xkcd: It's 'cause you're dumb.
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XKCD's Blue eyes puzzle is a logic puzzle posted around the same time as comic 169. Randall calls it "the hardest logic puzzle in the world" on its page; whether or not it really is the hardest is up to speculation.

The solution is at xkcd.com/solution.html.

The page contains two comics. On the top is 82: Frame, and on bottom is 37: Hyphen.