At 11:21 a.m. on April 20, 1999, the 911 call came, alerting authorities that 18-year-old Eric Harris and 17-year-old Dylan Klebold had begun a deadly gun-and-pipe-bomb spree that ended with their suicides, 13 fatalities, and 23 injuries.Â The Denver Post took a look at the Class of '99 over the weekend, quoting experts who say that although some have moved on, most have "felt both positive and negative effects of survival." Hundreds of people gathered last night at sunset, on the eve of the 10th anniversary of the Columbine High School massacre, for a candlelight vigil to remember the 13 victims (viaÂ The Associated Press and images fromÂ 5280's Jeff Panis.) The school will be closed today, and families of the victims will gather privately for a service at the Columbine Memorial. The post-Columbine world is one in which visitors to most school buildings have to be buzzed in and receive identification, writesÂ Newsday. TheÂ Fort Collins Coloradoan points out that officials hope new programs help prevent a similar tragedy from ever happening in the Poudre School District. In Colorado Springs, students at an elementary school recently made a spider web of blue wool--a symbol of how bullying can weave itself into their lives (via theÂ Gazette). The Columbine Courier interviews the incident commander on the scene that day at Columbine, exposing some still-raw feelings. Meanwhile, as a reporter for Salon and Slate, Dave Cullen wrote about the tragedy 10 years ago--and has continued to do so for his book, "Columbine," described byÂ his editor as a "chilling page-turner." Cullen's "The Four Most Important Lessons of Columbine" was recently published on Slate.