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How World War I Spy Catchers Popularized UV Lamps
Gizmodo
By Esther Inglis-Arkell
Dec 1, 2015, 12:15 pm
150 pts
Trending
Today ultraviolet lamps are used during lackluster raves. But they have an impressive history: They were first regularly used during World War I to secretly monitor spies. Read more...
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