A Wisconsin high school student was inspired by horrific school shootings to invent something that could save lives. Somerset High School senior Justin Rivard invented a tool he calls the "JustinKase" in shop class. Made of steel plates and connecting rods, his device slips beneath a classroom door and latches to the door’s jam. With his device in place, Rivard has yet to find a person who can push a classroom door open, including linemen from his high school football team. “You can lock a door with a lock, it can get shot out,” he says. “You can lock a...