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Radiation was the propagation of energy from a source and through space or another medium. For example, infrared radiation was emitted by animal organisms in the form of heat and light invisible to humans.[1] Stars also emitted radiation, which some species that dwelt in the vacuum of space absorbed through their skin as a means of nourishment.[2] Signals transmitted through space could be corrupted by radiation through a process called radiation interference.[3] A coating of chromium could reflect certain harmful radiations.[4]



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