Technology
A wooden seal hid a listening device for seven years
HERE’S THE INTERESTING PART
For seven years, the US Ambassador to the Soviet Union unknowingly kept a listening device directly above his desk. 'The Thing' was an espionage device hidden inside a carved wooden seal presented by Soviet schoolchildren. It possessed no batteries or power source, instead using a tiny membrane that only activated and transmitted audio when illuminated by a specific radio frequency from a nearby van.
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