In the spring of 1999, 12 students and a teacher were killed by two gun-toting teenage boys at Columbine High School in Littleton, Colorado, making school safety and security an overnight priority in communities across the nation. Many schools are starting to borrow security methods and technology from the business world such as video intercoms, smart cards, and surveillance cameras. Years after the worst school shootings, new building plans, combined with new technologies, make for safer and more secure environments. (Lists 8 online resources.)