Actually that is something I have wanted to ask about but I haven’t really found the right person to ask or the right forum, that being, how many instances do we see in which something that was previously completely written off of pseudoscience turn around and actually become established science.

Off at the top of my head the only thing I can think of is how the existence of germs was originally thought of as complete Insanity, and the paranoia of one addled individual who swore up and down that these invisible creatures where everywhere and were making everybody sick.

There is the matter of the Earth revolving around the sun being the reverse at one point, which is mistaken for a religious claim however at the time of galileo, other scientists came to completely different conclusions with their own telescopes and had refused to endorse his position due to a lack of evidence.

If I remember correctly, Galileo had an obsession with pillars that would have been even stronger evidence than what he thought he saw in the telescope had he just looked a little closely. One of those crazy little ironies I suppose.

And finally, the Big Bang Theory in a weird inversion of expectation was actually established by a priest, who was mocked by scientists who came up with the name Big Bang as a way of writing off his idea as a uniquely Catholic perspective that no way resembled good science. And then the steady state universe theory kind of collapsed and was replaced by the Big Bang Theory that had been so mocked. If I were correctly I believe Albert Einstein had his photograph taken with this priest.

But outside of that, I can’t think of anything, it would be cool to find a list of these somewhere.