Electromagnetic signal: In physics, it is a wave propagated through space or matter by the oscillating electric and magnetic field generated by an oscillating electrical charge. The heart is the most powerful source in the human body. (Childre, Doc and Howard Martin. The HeartMath Solution. CA: Harper SF, 1999, p 267)

Electromagnetic waves or EM spectrum is a label for radiation energy, the rays of which travel and spread out as they go. Examples include visible light, radio waves, ultraviolet light, gamma rays, X-rays, and microwaves. (NASA’s Imagine the Universe. Electromagnetic Spectrum, Introduction. Article.)

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