As you're going to hear, ad nauseam, from every news organization on the planet -- today marks the tenth anniversary of the Columbine High School shooting.
Do yourself a favor and ignore most of the sullen and somber think pieces, pontificating on what happened that day and what we've learned since then, and just buy and read Dave Cullen's shockingly good and exhaustively researched new book, Columbine.
Cullen, a contributor for Salon.com, has spent the past ten years poring over every detail of the shooting -- particularly, who Eric Harris and Dylan Klebold were and what might have caused them to kill.
Suffice it to say, almost everything you know about the Columbine High massacre and its gunmen is wrong and has been since almost the very beginning.
Seriously, read it.
Dave Cullen: Columbine