Quote:
Originally Posted by IliketoPuck
A couple that come to mind (of a similar vein):
The discovery of vaccination by Edward Jenner (and it's continued improvement and expansion), and the discovery of penicillin by Sir Alexander Fleming radically changed human life expectancy, and ushered in a new era for the general quality of health in society.
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I'd add John Snow the father of epidemiology who worked out it wasn't healthy to drink sewage water, kicking off both the statistical and geographic tracking of diseases and also modern sanitation.