Here's What Happened When the Supreme Court Ruled on Whether Students Can Protest During School

High-school students nationwide have already taken to the streets in response to the Feb. 14 shooting at Marjory Stoneman Douglas High School in Parkland, Fla., which left 17 dead. Pressing for a variety of gun-control and school-safety measures, they have staged "die-ins" and walkouts, and are planning National School Walkout days and a March for Our Lives for the coming months.