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Of course, the answer is obvious, once you think about it even a bit. Is there a collection of such “why sky is blue” questions (i.e. very simple questions, not necessarily with simple/obvious answers)? Just for physics for starters, but from all areas ideally.
ELI5 is kind of similar to that, but not exactly. But maybe there is a curated list of such questions which appeared in r/ELI5?
pretty good site idea
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