I have often sensed that a really easy math CAPTCHA would improve conversations about economic inequality.
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A captcha for when you only want extraterrestrials from more advanced civilizations to sign up: what is the largest couch area that can go through an L shaped corridor of width W? Or for when you cryo freeze, to ensure it’s sufficiently future. http://wikipedia.org/wiki/Moving_sofa_problem …pic.twitter.com/a11NYzN7tX
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PIVOT!!
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It is real, and was active for a couple of years around 2009 on a Russian meme website, Lurkmore.
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Or maybe this exact CAPTCHA isn't from there, but it looks similar enough.
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don't think so :) had read about it herehttps://math.stackexchange.com/questions/2266227/solving-math-captcha-involving-a-limit-and-sin1-x/2266239#2266239 …
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Couldn't resist : might be complex if the inner part of the square root is negative...
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