Short answers, pulled from the story.
James Clerk Maxwell published a set of equations that unified electricity and magnetism into a single field theory in 1864. These four mathematical statements described how electric charges create electric fields and how moving charges generate magnetic fields.
Heinrich Hertz confirmed this prediction in 1887 by generating radio waves in his laboratory. His experiments used electrical circuits designed to oscillate at frequencies much lower than visible light.
William Herschel discovered infrared radiation in 1800 while studying sunlight with a glass prism. He placed thermometers beyond the red end of the visible spectrum and found temperatures rising higher than expected.
Wilhelm Röntgen discovered X-rays on the 8th of November 1895, after noticing fluorescence on a nearby coated glass plate during high voltage experiments.
The World Health Organization classified radio frequency electromagnetic fields as Group 2B possibly carcinogenic substances in May 2011. This category includes potential cancer-causing agents such as lead and styrene alongside radiofrequency exposure.