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The scientific demonstration of the existence of electromagnetic waves is usually attributed to Heinrich Hertz and they were predicted by James Clerk Maxwell. Electromagnetic waves are electromagnetic radiation, though electromagnetic radiation occurs in many forms and those many forms were known substantially before anyone realized they were electromagnetic. As an example, sun light is electromagnetic radiation and, while we knew about sunlight for all of the time of human existence, we did not know it was electromagnetic until the 19th century.

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12y ago

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