Every day, we've been following new developments from the Parkland, Florida school shooting that killed 17 people — and the #neveragain movement that's followed.
A variation on the adage "If You See Something, Say Something," first introduced in a jittery New York City after 9/11, is being adopted by schools at a time of heightened vigilance for the next classroom shooter.
School violence cannot be avoided entirely, but through a conscious effort from school staff and law enforcement, today's students can be safer than in the past.
President Barack Obama says that every four months, his hometown of Chicago suffers the loss of as many children as were killed in the Connecticut elementary school shooting.