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Louis Pasteur (1822–1895) was one of the great French scientists, famous for his work with curing rabies and developing the idea of vaccination. He also championed the radical idea that dirty hands, clothes and instruments in hospitals contributed to the spread of disease, and basically demonstrated the germ theory of disease to be correct, although not in every case.
He is beloved of creationists because he disproved spontaneous generation. They completely ignore, as is their forte, the fact that their idea of spontaneous generation and the idea that Pasteur disproved are vastly different things. He disproved the idea that bacteria formed in a broth of their own accord, using a flask which bears his name. Creationists think™ that he disproved the idea of a non-supernatural abiogenesis event.
All in all, he was about as practical a scientist as one could possibly be, a brilliant man to whom millions of people owe their lives and one who it can truly be said made a difference in the lot of nearly all people alive today.
That said, there are still those who consider vaccination and pasteurisation to be the work of the devil (or at least a big agribusiness conspiracy), although these processes have saved countless lives over the years.[note 1] Vaccine denialism and germ theory denialism still flourish today in spite of mountains of scientific evidence as to their efficacy.
Pasteurisation, the process of heating/cooling food to kill germs, was also an idea that began with Pasteur (hence its name). In much of the food industry, particularly the dairy industry, it is considered one of the most important front-line sanitation procedures.
Pasteurization does have the drawback that, as it's a heat treatment, it destroys those vitamins that break down when heated. For that reason, pasteurized milk is usually sold with Vitamin D and vitamin A enrichment. It does not, however, destroy macronutrients — proteins, fats, and carbohydrates. If a food item is heated so hot that its macronutrients are damaged, we don't call it pasteurization, we call it burning.
- Pasteurization of milk has all but eliminated milk-borne tuberculosis, diphtheria, salmonellosis, strep throat, scarlet fever, listeriosis, brucellosis and typhoid fever.
- Louis Pasteur
- See this Answers Research Journal article, for example. http://www.answersingenesis.org/contents/379/Louis-Pasteur.pdf
- Ullmann, Agnes. Louis Pasteur Encyclopedia Brittanica. Dec 23, 2019.