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# Nuclear power (and weapons) which was (mainly) discovered by Einstein's E=mc2 , which was then elaborated on byu many other scientists. # Biological warfare, and the mass killings caused by poisons. (Poison existed before, but this made it much, miuch more potent)

# The advanced physics and mathematics research into factories which makes anything from canned beans to machione guns incredibly cheap and efficient, while maximising potential. (Again, it existed before, but this makes so much much easier, not only weapons, but human rights abuse in East Asia)

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Q: What are the 3 innovations in 20th century that caused unfavourable side effect on human life?
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