This usage of the word "dark", or this concept it refers to - do you happen to know if you picked it up from somewhere in particular?
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Dark matter, from physics
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Ah. I'd heard about it differently as a kid but rereading the description on it now I see that connection.
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Illustrates the point nicely I think:https://twitter.com/Megillus/status/1001537824670322688 …
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"Philosophers on Couches Getting Coffee"
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So those are the known unknowns.
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