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Alexander Flemming created the first anitbiotics.
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This is what caused vaccinations, alchohol to remove bacteria, and burning metal to disinfect it.
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Einstien's Theory of Relativity explains the relationship between speed, time, and distance
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Georges Lemaître came up with a theory that stated the universe was once a dot that expolded and everything landed perfectly in place to create the universe.
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At this time the earliest form of the scientific method was created,