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A genius invention from 800 years ago! Why can lanterns roll freely without going out—what’s the und

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What is the principle behind submarines? What's the difference between nuclear and conventional subm

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When an earthquake occurs, which is safer—the lower floors or the higher floors? Let's start by exam

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How did the ancients make salt? Can you make edible salt by boiling seawater dry?

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Where is the airplane's fuel tank? Given how expensive aviation fuel is, why do planes still dump fu

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