Everything you remember about Columbine is wrong. A new book out reminds of what really went down. One interesting tidbit from this page:
Myth #5. There were no warning signs that could have prevented the Columbine massacre.
Truth: Other parents had complained about Eric Harris, multiple times. Both Eric and Dylan had been arrested before. Thirteen months before the shooting, investigators discovered evidence that Eric was building pipe bombs. Dozens of pages of obscene threats on the internet were also documented. The sheriff’s department covered up the initial evidence that signaled the threat.