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Water Fluoridation: Just the Facts
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Why Do Some Cicadas Appear Only Every 17 Years?
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7 Everyday English Idioms and Where They Come From

sum tone

sound

Learn about this topic in these articles:

sound perception

  • Watch a suspended vibrating spring to learn about the propagation of sound waves
    In sound: The ear as spectrum analyzer

    …of new pure tones: the sum tones,and the difference tones,

    Read More
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