A day like no other: the Las Vegas mass shooting lessons from America's largest mass casualty event.

Summary: On October 1, 2017, Las Vegas faced the worst mass shooting in modern US history. Hundreds of badly hurt people rushed to hospitals all at once, without any warning. Doctors and nurses quickly realized their normal emergency plans wouldn't work for such a huge crowd. Instead, they had to use military-style teamwork and focus on moving patients through the hospital as fast as possible. They also learned that sharing supplies and doctors between different hospitals is the best way to handle a massive crisis. These tough lessons are now helping hospitals all over the world get ready to save lives when the worst happens.