Which innovation surrounded by medical science have done the most to affect humanity contained by the 20th – 21st Century?

What is medical science?
Answers:
Silicone.
Atomic and Nuclear Bombs - used in world wars and considered today as concealed weapons of powerful nations and terrorists. They make the world travel crazy.
pramod has it right - the discovery of antibiotics
Penecilin
It's got to be vaccines.
organ transplantation

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