Science
What is the opening of a lens, which controls the amount of light?
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About how long does it take for sunlight to reach the Earth from the Sun?
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Which song was used to wake up the first Space Shuttle crew in orbit?
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Which characteristics do organisms use to help them survive in their environment?
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What is the art of growing a miniature tree or trees in a low-sided pot or tray?
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In which constellation was the first double star observed?
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What is the watering of land by artificial means called?
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