Science
What was the first sound-recording device called?
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Who was the first President of the "Planetary Society", an organization of amateur astronomers?
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Which of the following is not a planet in our solar system?
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What was the name of the first artificial satellite launched into space?
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Which of these is the formula to convert Fahrenheit to Celsius?
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About how many years does it take for Pluto to go around the Sun for a complete revolution?
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How often does sunspot activity reach its lowest point?
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