2015 is the International Year of Light and Light-based Technologies, and we should not keep X and gamma rays out of the party. Contrary to popular belief, light, at least from the physicist’s view, is much more than just the electromagnetic radiation that we see directly with our eyes. But even if we accept that light is the agent making objects visible, how could we deny a “VIP” pass to the party to the rays discovered by Roentgen in 1895? We should not forget that thanks to his X-rays we have managed to see beyond the visible surface of objects.
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