In the wake of the mass shooting in Parkland, Fla., the activism of the students at Marjory Stoneman Douglas High School and elsewhere has drawn national notice. Although federal action on gun control is uncertain, the Florida state legislature on Wednesday passed a bill to impose a three-day waiting period for most purchases of long guns, raise the minimum age for purchasing those weapons to 21, and allocate funds to improve school security and train and arm school employees.