Science
What is the repeated sound when sound waves bounce off other objects called?
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What is the female reproductive cell of flowering plants?
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Who was the first person to use a telescope for astronomy?
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In which constellation does the vernal equinox appear?
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Transfer of heat through a substance by molecular action best fits which science term?
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Which branch of science did young Carl Sagan tell his grandfather he wanted to practice?
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What is a machine capable of performing tasks automatically called?
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What constant is equivalent to 96,485 coulombs per mole of electrons?
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