Science

How many astronauts walked on the moon before 1970?

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Which kind of tree is most often struck by lightning?
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What famous scientist introduced the concept of "space-time"?
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Halley's Comet is predicted to appear again in which year?
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What blood vessels take blood away from the heart?
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Which scientist died the same year Sir Isaac Newton was born?
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What is the proper name for a "sundog", or an atmospheric optical phenomenon?
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Which one of the original 7 astronauts sported the middle name of Herschel?
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Which of these is a property of a marble?
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