Paint which contains luminous zinc sulfide illuminates in the dark because the zinc atoms absorb light energy. When the lighting in a room is off, the zinc atoms release their energy which makes them phosphorescent. Similarly, when the water molecules within the human body are hit with a high magnetic field, they emit radio waves. It's possible to detect these signals and create maps of the inside terrain of the body. Dr. John Shank helped develop a magnetic resonance imaging aparatus which was ...
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