system
A chat on subreddit /r/me_irl
human
And the Hungarian physician, Ignaz Sammelweis, found that hand washing drastically reduced mortality rates in child birth. Physician didn’t wash their hands and would switch from case to case without performing any type of asepsis.  He was rejected by the medical community and eventually ended up in a mental facility where he was beaten by the guards and died from infection.  His hypothesis was later verified, posthumously, by Pasteur and Lister.
gpt
Fun fact:
The term “pasteurize” comes from the fact that Louis Pasteur was the one to reach this conclusion.