The Cuban Embassy in Havana dropped by half of the 2017 staff, when diplomats defamed headache, nausea, and other illnesses, when noises were introduced to homes and surrounding hotels.
The mysterious waves of illness increased the speculation by the workers of an acoustic weapon. It was an explanation, to raise weight, a permanent and high-level drone made by the US staff was published at the Associated Press.
But a new audio recording test reveals that it has been a true source of solar perception that scientists in the United Kingdom and the US today believe: short kakar Indians, known as Anurogryllus celerinictus.
"The recording is definitely the cricket member of the same group," said Fernando Montealegre-Zapata, professor of the biology of the University of Lincoln. "The call from this Caribbean species is about 7 kHz and it gives an unusually high rate, because humanity gives a sensation of a dense compact."
As a child born in South America, Montealegre-Zapatak has crickets of a similar species and keeps the cage from the room. At night, a sharp sharp sound woke up. The reason was a male called by friends. The minister was banned, but Montealegre-Zapate still listened to the cricket of women's cricket.
"I am not surprised by people who do not know the sounds of insects that can destroy this call," he said.
Identifying the source of the sound does not mean that some kind of attack does not occur, but it is doubtful for the people in charge of the health of the diplomats. The cause and nature of the illnesses are not clear.
Due to the health problems reported by US diplomats, doctors have taken doctors at the University of Pennsylvania with almost two dozen ambassadors. In the past year, in March, the diplomatic team suffered from concentrated injuries, but the doctors questioned the consequences, when doctors interpreted the test results poorly.
Not all the diplomats affected when they became ill when they appear unusual sounds, and the descriptions of noise differed with different people. Some recalled sounds like grinding or dying, while others had an affliction caused by open car windows.
In the new study, Montealegre-Zapata and Alexander Stubbs sought a scientific database in the University of California to combine Catalan recording. The short-knit call in the Indies was quite similar, they found that the acoustic pulse repeat rate and the specific frequencies were higher than others.
But the cricket home call and the Cuban recording did not match. The sound recorded in Havana had different pulse structures that did not call insects.
Stubbs and Montealegre-Zapatak realized that the discourse could be recording environments. Scientists tend to keep the insect calls away, while diplomats accused of unpleasant sounds inside. In the Cuban recording room, the extravagant pulley structure can lead to walls, floors and ceilings.
The researchers tested the idea, calling in a short kennel in the Indies in a single-room room. The recording from the room shows that the sound was different from the pulse structure observed in Cuban recordings. Both sounds were closely linked.
Gerald Pollack explores how McGill University's detection and separation of animals in Montreal: "It shows how paper can make a song of criticism, based on the echo of what is expected in an indoor environment, it produces dramatic and quantitative sounds similar to that provided by the AP This is a very sharp explanation. "
He said he had no personal experience with short kakas in the Indies, which never caused anything. "As far as I know," he said, "except for night-time nights, no one harms the call of criticism."