Science
Which of these planets is smallest in diameter?
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What is the world's largest non-profit, scientific and educational organization?
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About how many days does it take for the moon to pass through all phases?
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Which one of these colors is NOT part of the primary colors of light?
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Marie Curie spent much time studying which of these subjects?
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Who was known for his famous "oil-drop" experiments to determine the charge of the electron?
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