25 years since Columbine: We're closer to decoding mass-shooter psychology

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25 years since Columbine: We're closer to decoding mass-shooter psychology

At roughly 11:19 a.m. on April 20, 1999, 18-year-old Eric Harris and 17-year-old Dylan Klebold emerged from their vehicles in the parking lots of Columbine High School. Clad in black trench coats, they started strolling toward the school entrance. Klebold lobbed a pipe bomb. Then the duo brandished guns and started shooting. Armed with a TEC-9 semi-automatic pistol, two shotguns, a carbine, as well as dozens of pipe bombs and mounds of ammunitio…