Science
Who discovered the supernova and was the first to theorize that stars "die"?
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What is the female reproductive cell of flowering plants?
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How long, in kilometers, is the average single thread unwound from a silkworm cocoon?
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The four engines of a Boeing 747 jet produce 188,000 pounds (85,275 kilograms) of what?
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Which of these is a factor that is tested in the scientific method?
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What is Neptune's period of revolution around the Sun?
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Which of these measurements would be different on Mars than on Earth?
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