Science
What is the opposite to ordinary matter called?
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What would you use to measure the mass difference between two like objects?
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What is the repeated sound when sound waves bounce off other objects called?
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What is the name of the spacecraft that took the first men to the moon?
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What scientist is credited with developing the first vaccine?
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Who was the first woman to win the Iditarod sled dog race?
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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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