A shocking 187,000 school students have been directly exposed to gun violence since the Columbine school shooting in 1999. Millions more endure the trauma of being in "lockdown" and "active shooter" drills that occur regularly in schools today. Dr. Terri talks to Nancy Kislin, a licensed social worker, family therapist and author of the new book, "Lockdown: Talking to Your Kids about School Violence." Nancy discusses accessible tips to support the mental health of your children, while offering them the knowledge and comfort that they will be safe everyday.