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by sharkweek 4482 days ago
My math teacher in high school (this was before Wikipedia) told our calculus class at the beginning of the year if we could prove how to only use four colors on a map without any similar colors touching, he'd give us a 4.0 for the class.

Years later and long after I had forgotten most of the math I learned, I saw the four color theorem on Wikipedia and got such a kick out of the absurdity of my teacher's offer.

Brought it up with him when I randomly bumped into him a little bit ago, he got quite a kick out of it.