History is full of all kinds of examples.
Edit: I meant "yes, someone with more knowledge please answer this question". Not "yes, it could be dark matter"
https://en.wikipedia.org/wiki/Massive_compact_halo_object
(that doesn't mean it's categorically wrong, just decided to be so unlikely to be correct that it's not worth our time)
Log-Log graphs of new cases vs confirmed cases (which that graphs) is by far the best way to represent the data that I've seen.
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