Science
Discovered by Alexander Fleming, what is now used to treat infections?
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Which song was used to wake up the first Space Shuttle crew in orbit?
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What is the rhythmic repetition surrounding the planetary day called?
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What space object did some ancient cultures rely on to tell the passage of time?
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What word is given to sounds that are too high for humans to hear?
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About how long does it take for sunlight to reach the Earth from the Sun?
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What scientist first showed that a changing electric field produces a magnetic field?
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