Vaccination. I once did an exercise where someone said put your hand up if ypu wpuldn’t be here today if not for modern medicine. About half the people in the room put their hands up. Most of them would have died at birth. Of those remaining, how many do you supposed would have been killed by diseases they are now vaccinated against? Modern medicine has a long way to go, but it is arguably our greatest scientific advance… In my opinion, vaccination is the widest spreadung life savibg measure in medicine, competing possibly with sanitation.
Discovery I would say gravity so far – because this is the gateway to modern physics so thanks again Newton 🙂 Invention – I am biased here but the steam engine would come at the top of my list – using science to harness the energy and make it work for us is what drove the industrial revolution and this is a very big stepping stone to where we are today. (Cars and planes come a close second, with lenses and telescopes next)
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