Science
What tool do people at sea use to measure distance with echoes?
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What is the ripened ovary of a plant containing the seeds?
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Which inhospitable desert holds the world's richest deposits of dinosaur remains?
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How long does it take for Saturn to rotate completely on its axis (a typical day)?
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According to Ohm's Law, what would the resistance be in a circuit with 40 volts and 8 amps?
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Who is regarded as the man who invented the telephone?
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What famous scientist introduced the concept of "space-time"?
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