Havana syndrome sees uptick in cases, concerns, and questions

In 2016, dozens of diplomatic staff at the U.S. and Canadian embassies in Havana began experiencing a sudden onset of health troubles with no apparent cause. They reported a variety of symptoms, including vertigo, nausea, vision and hearing difficulties, memory loss, and headaches. Many said they felt something pressing or vibrating around them or heard noises just before the symptoms appeared, leading some to suspect they had been exposed to a high-intensity burst of energy or sound waves.

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