IN 2019, THE U.S. STATE Department asked the National Academy of Sciences to examine the cause of an array of mysterious health complaints experienced by American embassy diplomats and their families who were stationed in Cuba. Dubbed “Havana Syndrome” in the media, the outbreak began in late 2016 when staff reported hearing strange sounds before feeling unwell. Symptoms included headaches, dizziness, fatigue, ear pain, disorientation, confusion, insomnia and difficulty focusing. Most alarming were the mysterious concussion-like symptoms in the absence of head trauma. Theories ranged from sonic weapons to microwaves, pesticides, and mass hysteria. Topping the list of suspected culprits: Russia, China, and Cuba.