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The Demaine family have to be the highest powered academics whose work resembles a preschooler's output.
I'm a geocacher, and I must say, this is a treasure trove of ideas for puzzle geocaches to create. I can't wait to make use of them. What a cool list!
Figlets for the thinking person.
This is insanely cool. Reminds me of a certain book (by a certain author who I wouldn't be surprised to find on HN) but I don't want to say which one because it would spoil the ending.