Hertzian waves have been mentioned - I've not studied physics so I looked it up, and one page said:
It was James Clerk Maxwell, however, who built the theoretical bridge from electricity to radio. Intrigued by Faraday's work, Maxwell developed a set of equations to describe mathematically how a changing magnetic field produced an electric field (electrical induction). He discovered that the opposite was also true, and that changing magnetic and electric fields in space produced electromagnetic waves. He showed how these waves traveled at the speed of light, and that in fact, light was just another form of electromagnetic wave.
All of that recalls early reboot Garth and Rokk coming to blows over the receiver/transmitter (aka Imra).
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