There’s little definitive information, according to the State Department. But several American embassy workers living in Havana were sent home late last year suffering from mysterious hearing loss. Then two Cuban diplomats were sent home from the U.S. in May. Some U.S. officials reportedly believe the cause was a sonic weapon, inaudible to human ears but capable of causing significant hearing loss, that was deployed in or near the Americans’ residences. Cuban officials have denied all such allegations, protested their diplomats’ expulsion and convened a committee to investigate the incident.