Science
What is the speed of Earth (Sol 3) around its primary (the sun, Sol)?
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Where are the male sperm cells formed in flowering plants?
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Who was the first President of the "Planetary Society", an organization of amateur astronomers?
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Which inhospitable desert holds the world's richest deposits of dinosaur remains?
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Discovered by Alexander Fleming, what is now used to treat infections?
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Which of these is the best definition of a compound machine?
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