I was about to make a joke mixing epidemiology & epistemology, but I didn’t know who would get it.
More people got this than expected. In truth, a well-handled joke.
Turns out this GIF was a crossover epistemology/epidemiology reference too. But I got so obscure nobody noticed!

https://en.m.wikipedia.org/wiki/John_Snow 
John snow had the well pump handle removed to stop the spread of cholera from a contaminated well.

It took over a decade for people to agree his truth about disease spread.
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