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More from Chalkdust
NEW! Pop-math book club
Do you have lots of unread pop math books on your shelves? Join our new monthly online book club!
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Platonic shapes from tube maps, flexagons, and more mathematical craft
What’s hot and what’s not
Optimal Pac-Man
Ghostbusting with graph theory
Reinventing 2D
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How similar are you to your friends?