MEDUSA: Microwave crowd-control raygun

As part of the U.S. Navy's investigation into futuristic nonlethal weaponry, the Sierra Nevada Corporation is building a microwave energy pulse gun that can produce a painful screaming sound inside a person's head from a long distance away. The inescapable sound, which is inaudible to untargeted bystanders, can be set to irritate, nauseate or even incapacitate people and animals that lie within range. Future applications may include crowd control, military use and even shopping mall security, provided it proves safe from permanent side effects. The science behind it also has the potential to give hearing to certain deaf people, or even projecting voices into peoples' heads.

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