Sounds you cannot hear
by
Explains the principles of sound, ultrasonic sound, radar, and sonar and discusses how certain birds and fish use ultrasonics to guide them.
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Explains the principles of sound, ultrasonic sound, radar, and sonar and discusses how certain birds and fish use ultrasonics to guide them.
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"Explains the principles of sound, ultrasonic sound, radar, and sonar and discusses how certain birds and fish use ultrasonics to guide them."
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