Beth Mole at Ars Technica reports that authorities don't know how 24 Americans were injured in mysterious attacks in Cuba recently. In August, U.S. authorities reported that American diplomats and their spouses stationed in Havana were targets of puzzling attacks for months. At first, the term “sonic attacks” was used, as some of the victims heard noises. Now, though, scientists have, "largely ruled out the possibility that sounds could cause traumatic brain damage," according to the story. Sometimes the attacks were completely imperceptible. Victims have complained of dizziness, nausea, headaches, balance problems, ringing in the ears (tinnitus), nosebleeds, difficulty concentrating and recalling words, permanent hearing loss, and speech and vision problems. Doctors have identified mild brain injuries, including swelling and concussion. Cuba says they have nothing to do with the attacks. U.S. officials now have the Cuban embassy operating with just emergency staff. On Dec. 6 the Associated Press quoted Secretary of State Rex Tillerson saying, "What we’ve said to the Cubans is: small island. You’ve got a sophisticated intelligence apparatus. You probably know who’s doing it. You can stop it. It’s as simple as that."