Science
Discovered by Alexander Fleming, what is now used to treat infections?
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What is the study of stars, planets and galaxies called?
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What is another way of saying "Organization of Petroleum Exporting Countries"?
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What is the repeated sound when sound waves bounce off other objects called?
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Where is the observatory where Percival Lowell first theorized the existence of Pluto?
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Where are the male sperm cells formed in flowering plants?
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Which parts of a flower are often brightly-colored and have many different shapes?
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Which of these is one of the three basic cloud forms?
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