Schools have become savvier about how to prevent attacks in the decade since the mass killing at Columbine, says the Christian Science Monitor. They have trained staff to spot signs of a student carrying a weapon and created teams of police and school officials to respond to threats. “It really did create a massive movement in the United States for improved school safety,” says Michael Dorn of Safe Havens International, a nonprofit school safety organization in Macon, Ga. Dorn estimates that hundreds of planned attacks have been averted: “To me, that’s an incredible success.”Tight budgets and short memories could mean waning vigilance. Many schools might be relying too heavily on technology and physical security, rather than tackling the more important challenge of creating a supportive culture. Ninety percent of 435 schools and universities said they are safer now than when the Columbine shootings took place, found a survey by Campus Safety Magazine.