Microwave Ray Gun Controls Crowds with Noise

A US company, Sierra Nevada Corporation, claims it is ready to build a microwave ray gun able to beam sounds directly into people’s heads. The device — dubbed MEDUSA (Mob Excess Deterrent Using Silent Audio) — exploits the microwave audio effect, in which short microwave pulses rapidly heat tissue, causing a shockwave inside the skull that can be detected by the ears. A series of pulses can be transmitted to produce recognisable sounds. The device is aimed for military or crowd-control applications, but may have other uses