Science
About how often does Halley's Comet return?
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Where is the observatory where Percival Lowell first theorized the existence of Pluto?
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What satellite series was known as "fellow traveler"?
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What organelle packages and helps in secretion of substances within the cell?
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What are the loosely packed cells just inside the upper epidermis called?
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If we multiply force by the distance moved, which quantity do we get?
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Which of these is a unit of length used in marine navigation?
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How many tons of meteor dust fall to Earth every day?
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