Working with the sewage system is what first came to my mind. As far as germs that is so modern. Ignaz Semmelweis was considered a moron for suggesting that do

Working with the sewage system is what first came to my mind. As far as germs that is so modern. Ignaz Semmelweis was considered a moron for suggesting that doctors wash their hands between handling dead bodies and delivering babies. He died in 1865 with the establishment believing he was basically spreading misinformation.