Mention523377

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so:text Now, since the time of Newton there had been a debate about whether light was a wave---that is, a traveling disturbance in some background medium---or a particle, which travels regardless of the presence of a background medium. The observation of Maxwell that electromagnetic waves must exist and that their speed was identical to that of light ended the debate: light was an electromagnetic wave. (en)
so:isPartOf https://en.wikiquote.org/wiki/Lawrence_M._Krauss
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