10/21: Nevada teacher killed in school shooting is a hero: Police; Scientists discover better way to transplant hair A 13-year-old middle school student opened fire on campus Monday just before classes were to begin, wounding two and killing a teacher who had intervened trying to protect the students; and, researchers have found a way to multiply the cells at the base of the hair that make hair follicles. They transplanted the cells onto human skin grafted onto backs of mice, and within weeks, normal hair was growing.