As the numbers of the dead from a Newtown, Conn., elementary school shooting climbed into the double digits, it's hard not to remember that we have been here before.
The Sandy Hook elementary school shooting is the deadliest at a high school or grade school in the history of the country, but it is far from the first. Several mass school shootings have speckled our recent history.
LIVE UPDATES: Newtown, Conn., School Shooting
Thirteen years ago, the small community of Littleton, Colo., was...Full Story