In most hospitals, highly-trained staff members know just what to do in the case of an emergency, whether it is a fire, hurricane, or even an active shooter. But what happens when that emergency comes in the form of a dangerous cyberattack? Children’s National Hospital in Washington, D.C., has developed a system-wide “off” switch that staff can activate if it is clear that the hospital has come under a broad-based ransomware or malware attack.