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Q&A Human echolocation for spies. What sound to use?

There are reports of blind people being able to develop an echolocation ability, by listening to the echo of sounds emitted by them. Since this ability is pretty handy for spies and soldiers, the ...

8 answers  ·  posted 7y ago by L.Dutch - Reinstate Monica‭  ·  last activity 7y ago by L.Dutch - Reinstate Monica‭

Question espionage