Math that will make you think. Twice....maybe

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Airport Puzzle: https://www.theguardian.com/science/2016/jul/18/did-you-solve-it-wheres-the-best-place-to-tie-your-shoe-in-an-airport

Fraction of Girls Explanation: https://mathoverflow.net/questions/17960/google-question-in-a-country-in-which-people-only-want-boys/17963#17963

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