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http://www.magnet.fsu.edu/education/tutorials/tools/faradaycage.html
Faraday's cage is an important structure used to keep the subjects inside the cage from the external electromagnetic radiation. Michael Faraday
created the cage in the 1830s when he "lined a room in metal foil and bombarded it with electricity produced by an electrostatic generator.
The movement of electrons along the surface of the metal served to create an electrically neutral area inside the cage." This is why it's safer to be
in a car during a lightening storm.