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Re:Dark Matter May Be Trapped in All the Black Holes by mabbo on Tuesday August 08, 2017 @05:05PM (#14962691)
You should give the book "We Have No Idea"[0] a try. It's the author of PhD Comics. It's first chapter explains pretty well why we know dark matter exists.

[0] https://www.amazon.com/gp/aw/d/0735211515/

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