In 2016 employees of the American consulate in Havana, Cuba, began hearing strange sounds and vibrations. A short while after the sounds first began, 24 workers at the consulate fell ill. Headaches, dizziness, nausea, loss of hearing, brain swelling and minor memory loss were their symptoms, which match those of a mild traumatic brain injury. The US government cried foul, blaming Cuba for the incident or at least for failing to protect the US citizens affected by the "attack" between December 2016 and August 2017. It led to the expulsion of 17 Cuban diplomats and increased the animosity between the two nations. Then the sound stopped. But the strange incident appears to have resurfaced in China in May. Initially just one person was evacuated from a US government facility after displaying "similar signs" of possible brain injury after hearing strange sounds. But that figure has since risen to 11, eight of whom are Americans associated with its consulate. And the sound may be on the m...

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