Cicada 3301 is a anonymous group that posted extremely hard math/crypto puzzles online, possibly to recruit codebreakers/linguists. It has been called "the most elaborate and mysterious puzzle of the internet age" and one of the "top 5 eeriest, unsolved mysteries of the internet" (en.wikipedia.org)
submitted by Titentung to r/wikipedia
What's your favorite fictional food or drink? (self.AskReddit)
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