Cuba’s ‘sonic attacks’ also can honest possess been a side-assemble of spying
The scientists tested their hypothesis by replicating the « chirping » from an AP video using two ultrasonic emitters that combined tones, one at 25kHz and another at 180Hz. That produced a similar-sounding 7kHz frequency with ripples of sound at an even 180Hz spacing. The team even built a device that would simulate eavesdropping by playing a…

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