Today's Flash Back Friday comes from Episode 193, originally published in December 2013. Dr. Robert Bristow is the Medical Director of Emergency Management at New York Presbyterian Hospital, Director of Disaster Medicine at Columbia University's College of Physicians and Surgeons, faculty member of the National Center for Disaster Preparedness in the Columbia University Mailman School of Public Health, and consultant to National Geographic’s new film "American Blackout." He explains what would happen if there was a national power failure in the United States caused by a cyber attack. He shares some things to keep in mind for emergency preparedness. Website: Nat Geo's American Blackout