Mental be kind to your mind poster

At that time, there occurred a silent revolution in the concept of “material”. It is now known that electromagnetic waves are real and they propagate in a vacuum at the speed of light. It has no material, it is immaterial. Mental be kind to your mind poster. The nature of light is immaterial, the nature of the electromagnetic wave is immaterial. The absence of a material in the electromagnetic field will lead to a new philosophical conception of nature that we will talk about later.

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