Dave Cullen is the author of the Edgar-nominated book Columbine. More government research on school shootings can be found at davecullen.com and fbi.gov.
Our explanations for why students shoot their classmates are often completely wrong, writes Dave... MORE
As another school shooting rocks Littleton, Colorado, Dave Cullen reveals the secret meeting of... MORE
The suspect in the University of Alabama shootings is extremely unusual in one regard: It's a woman.... MORE