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A U.S. government health alert has sparked comparisons to symptoms experienced by State Department employees in Cuba:
US officials have issued a health alert after a US government employee stationed in southern China reported "abnormal sensations of sound and pressure" that indicated a mild brain injury.
The official, assigned to the city of Guangzhou, reported a range of physical symptoms from late 2017 through to April 2018, and was sent back to the United States for assessment, the State Department said. The US Embassy in Beijing learned on May 18 that the clinical findings of the evaluation matched that of a "mild traumatic brain injury," an embassy spokeswoman told CNN.
The alert will raise comparisons with a series of unexplained incidents in Cuba that led to the withdrawal of most US personnel from the embassy in Havana. The cause of those incidents, reported in late 2016 and early 2017, still remains a mystery.
[...] The State Department said in its Wednesday statement that anyone who experienced "unusual acute auditory or sensory phenomena" while in China should move away from the source of the noise.
Also at BBC, CNBC, South China Morning Post, and MarketWatch.
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A 'Sonic Attack' on Diplomats in Cuba? These Scientists Doubt It
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(Score: 3, Interesting) by anubi on Thursday May 24 2018, @06:13AM
My first impression is someone deployed an ultrasonic doppler presence detector, and did not turn off the ultrasonic emitter during the day.
I had the same impressions at a department store when I went to University. I could not be in that store but just a few minutes before I was headachey, uneasy, nauseous, the whole gamut of stuff I couldn't put a finger on. Talking to other students, I found mostly women were sensitive to it and felt it as well - but no one knew what it was.
I later experienced the exact same thing when I was working in the aerospace industry. They used ultrasonic presence detectors in the lab that were never turned off. I not only had my nausea, but I also had a spectrum analyzer and a microphone there. I can't hear it as a tone, it registers to me like a pressure and a dizziness. But the microphone did hear it. And the mystery to me was solved. Now I know why the earlier TV's and monochrome computer monitors would make me naueous ( Magnetostriction of the horizontal output transformer and CRT deflection yoke at 17.5KHz ) and one of my computers ( again, the power supply ) was giving me the heebie-jeebies.
I could hear the TV's, and that's what got me onto maybe this is something even higher frequency than TV deflection.
Some people are sensitive to ultrasound.... but we don't recognize what it is.
Maybe it works kinda like short wave ultraviolet being bad for the eyes [medscape.com], even though we don't see it as light.
"Prove all things; hold fast that which is good." [KJV: I Thessalonians 5:21]