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What about Marie Curie? Without her and her husband works, there is no atomic bomb, no Hiroshima and Nagazaki, no cold war, no medical isotope, no radio therapy, no nuclear power plants, no Chernobyl, no Fukushima, no radio isotope for dating in archaeology, and a lot more. Plus, her influence on the future could be even more important as new use of radiation will come up.
Pierre Curie die too early and without his wife who continued to work, their research may not have been as influential, so I propose Marie.
As for who to take out, I would keep only one of Socrates, Plato and Aristotle as they are all part of a same philosophy. I would keep Plato, since he's the one who wrote about his master and without him, Socrates wouldn't have made it to us.