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Who invented seismograph for detection of earthquake and measurement of its intensity?
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Who invented the World Wide Web? When was it?
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What is the process of food irradiation? And how does it prevent food spoilage?
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Who invented the first personal computer?
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ls it possible to ascertain directions from wrist watch like one does from compass?
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How does a combination lock work? Why is it considered more secure than the cylinder lock?