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When was the lighter invented?
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When was the theory of relativity published by Albert Einstein?
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Women were granted the right to vote in parliamentary elections for the first time in which century?
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In which century was the vitamin D discovered?
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When was the first working airplane invented?
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When were the French fries invented?
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When was the first Nobel Prize awarded?
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The Olympic Games revived in Athens in which century?
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When was the explosive TNT invented?
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When was Martin Luther King Jr. born?
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Hydraulic press was invented in which century?
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When was the vaccine for Mumps developed?
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When was Uranium discovered?
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When was Pablo Picasso born?
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When was the vending machine invented?
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