One day in March 2017, Mitch McKay and his wife, Suzanne, took a walk on the sand near Imperial Beach, a small surf town south of San Diego where they’d raised their children. Suzanne liked to collect sea glass, and they often brought a spare grocery bag to pick up any trash they found amid the seaweed and driftwood. “It was our ritual,” Mitch said. Back home, Suzanne started to suffer from splitting headaches that seemed to emanate from the back of her neck, near the base of her skull. The headaches... Читать дальше...