Say you're going to color a map. The only rule is that two adjacent regions of the map can't be the same color. How many colors do you need? Believe it or not, this is a problem that plagued mathematicians for more than 100 years—and it wasn't even solved until after humans set foot on the moon. How did we finally solve it? With a newfangled technology called the computer.
Coloring Outside The Lines
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The Four Color Map Theorem
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