Science
What famous scientist introduced the concept of "space-time"?
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Which one of these colors is NOT part of the primary colors of light?
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What is the repeated sound when sound waves bounce off other objects called?
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Which animal's chirps can be used to tell the temperature?
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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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What is the world's largest non-profit, scientific and educational organization?
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