One of the most famous one is the doctor who proved that it's better to wash your hands before an operation, and all the other existing doctors who never did that previously shunned him, because it would prove they "did their job poorly" before
oulipo · · focus · HN ↗
<a href="https://en.wikipedia.org/wiki/Ignaz_Semmelweis" rel="nofollow">https://en.wikipedia.org/wiki/Ignaz_Semmelweis
ZeroGravitas · · focus · HN ↗
The people who've been doing the operations for decades are much less open to this new informstion than newly trained doctors.