What Are Radio Waves? | Live Science
Information about the Elctromagnetic Spectrum - Wavesite
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Shortwave radio - Wikipedia
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JF Ptak on Twitter: ""Ultra-short radio waves aid in healing sick by producing heat that penetrates tissues." Popular Mechanics, October 1932. #histstm https://t.co/kOVYSmSMov" / Twitter
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Ultra-Short Radio Waves
