Hayley Hodson was a star athlete, and the future of women’s volleyball. She was the nation’s top pick in the sport, recruited to play for Stanford University. But during her freshman year, a volleyball brought her career to an end. She says she got a series of concussions in games and practices that were never diagnosed. The worst incident came in a game against UCLA. “I took this massive ball off my head that flew hundreds of feet away,” she said. Immediately, she knew something was wrong.