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...
Esther Inglis-Arkell, Gizmodo
Tue, 12/01/2015 - 10:15am
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...