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Questions designed to generate a "big list" of certain results, examples, conjectures, etc. via many individual answers, each contributing one or a few instances. Such a question should typically be in Community Wiki mode (CW); after asking, please, flag for moderators attention requesting the question to be made CW.

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Math talk for all ages

I always found the Collatz Conjecture to be both simple and fascinating (https://en.wikipedia.org/wiki/Collatz_conjecture) The operations are understandable to any 9 year old (who won a math competiti …
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