There are many scientific theory that have saved lives or even changed things in a good way but has actively been fought by its detractors? | Cheap Nursing Papers

There are many scientific theory that have saved lives or even changed things in a good way but has actively been fought by its detractors?

There are many scientific theory that  have saved lives or even changed  things in a good way but has  actively been fought by its detractors? Give an example of one of it and explain it fully please

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