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Who invented seismograph for detection of earthquake and measurement of its intensity?
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When was computer giant Microsoft Corporation established?
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Which was the most damaging earthquake in recent history?
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When and where were playing cards invented?
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When was the ship’s distress signal SOS/Save Our Souls used first?
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Who invented the first personal computer?
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What is pig iron? How did this name get derived?
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How was the circulation of the blood proved?
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When were elephants first used in war and how far were they effective?