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One of the most ingenious bugs
ever developed was "The Thing," 
a listening device found in the 
Great Seal that hung on the wall 
of the U.S. Embassy in Moscow. 
The seal, a gift from the 
Soviets, had a tiny hole under 
the eagle's beak to allow sounds 
to reach the listening device. 
Western experts were at first 
baffled; the Thing had no batteries,
no power supply, and did not transmit radio signals, which 
made it extremely difficult to detect. An expert from Britain's 
MI5 finally solved the puzzle; the Thing was hit with 
high-frequency radio waves from outside the embassy. Sound 
absorbed by the microphone caused the antenna to vibrate, 
causing modulations in radio waves beamed at it and reflected
back to a receiver.