Science
What is matter that allows light to pass through called?
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Where is the observatory where Percival Lowell first theorized the existence of Pluto?
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What is the tissue that gives rise to the xylem and phloem?
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Which animal's chirps can be used to tell the temperature?
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First appearance of light in the eastern sky before sunrise best fits which term?
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What form of energy are we using when we use an alarm clock or a dishwasher?
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How many astronauts walked on the moon before 1970?
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Who was the commander of the first U.S. Space Shuttle mission?
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