Science
Which of these is similar to the way sound travels?
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What is the female reproductive cell of flowering plants?
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Which of these is the best definition of a compound machine?
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Who discovered the supernova and was the first to theorize that stars "die"?
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John Glenn was the first American to orbit the earth, in how long a flight?
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What is it called when the Earth, Sun and Moon lie in a straight-line configuration?
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Which one of the original 7 astronauts sported the middle name of Herschel?
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What is the term given to heat and light radiated from the sun?
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What is the opening of a lens, which controls the amount of light?
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