They won’t sit quietly. Students across the U.S. are coordinating a gun control demonstration on Wednesday, a 17-minute walkout — one minute for each person slain a month earlier at Marjory Stoneman Douglas High School. On Thursday, police released 911 calls from the Feb. 14 Parkland, Florida, attack, including one from a mother whose daughter had just texted that three people in her classroom had been shot. Meanwhile, Florida Gov. Rick Scott signed a groundbreaking bill that restricts gun purchases, but also helps arm teachers.