Science
How many Earth years does it take Mars to go around the Sun?
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What liquid is used as a standard when measuring density?
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Which scientist died the same year Sir Isaac Newton was born?
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What piece of polished, cut glass can we use to see the spectrum of visible light?
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Which branch of science did young Carl Sagan tell his grandfather he wanted to practice?
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Which inhospitable desert holds the world's richest deposits of dinosaur remains?
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