January 14, 2013 10:56 am Teachers Train to Tackle Gunmen Texas teachers receive training on how to disarm a gunman, preparing themselves for the grim reality of workplace and school shootings. Elsa Ramon reports. US & World Videos 2:03 Does Shakira still believe in love following Gerard Piqué split? 1:36 O.J. Simpson's cause of death revealed 25:57 WATCH: ‘Changing Climate' highlights the Philly-area residents who are combatting climate change 2:36 Super dad makes Mario-themed obstacle course for son's birthday 4:17 How the Philadelphia Union became the sustainability champs of the MLS