Five years after a mass shooting that shook Florida, Marjory Stoneman Douglas High School and Parkland remain inextricably linked to the ghastly day when a troubled teenager in less than four minutes killed 14 students and three staff members, injured 17 more and traumatized an untold number of children and families. But the Feb. 14, 2018, tragedy also sparked a national movement created and led by young people, spurred changes in state law aimed at making schools safer and led to new firearm restrictions in what had been dubbed the “Gunshine State.” “It still feels like five minutes ago,” Fred Guttenberg, whose 14-year-old daughter, Jaime, was among the victims, told the News Service of Florida in a phone interview Thursday.