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The source of the mysterious noise in 'Leave the World Behind' is never explained but here are some real-life weapons similar to it
Infrasonic weapons fall under the same umbrella as LRADs of acoustic devices, but the former is much more sinister. Unlike LRADs, infrasonic weapons could hypothetically damage a target with a ...
TASS1y
Russia demonstrates Shershen ‘flying binoculars’ at Army international arms show
"The Shershen hexacopter was initially designed for dispersing mass events with the help of an infrasonic weapon but was modernized into a reconnaissance drone - ‘flying binoculars.’ ...