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Small-Scale Question Sunday for January 22, 2023

Do you have a dumb question that you're kind of embarrassed to ask in the main thread? Is there something you're just not sure about?

This is your opportunity to ask questions. No question too simple or too silly.

Culture war topics are accepted, and proposals for a better intro post are appreciated.

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Aliens?

More seriously, is it that we don't understand how it works, or why it evolved?

There are competing hypotheses for how it works, but nothing conclusive.