
Medicine, maybe. Medicine mainly treats disease, rather than preventing it. (But, to that end, many of them are very effective at treating those diseases. Where would we be without antibiotics? And, actually, come to think of it, especially for things like bacterial diseases, curing one patient can prevent that patient from spreading it to many more.)
And there’s no way that vaccines haven’t made a huge difference. Entire diseases – that used to ravage populations horribly – are now completely eliminated.
Sanitation does deserve a lot of credit, sure … but it wasn’t sanitation that defeated smallpox.















So, yeah. 1st amendment means absolute nothing these days, eh?