We all remember the stories of fellow concertgoers who sprang into action in the wake of the Las Vegas shooting.
The harrowing images really showed the good in humanity.
Bystanders secured makeshift tourniquets and even took gunshot victims to hospitals in the backs of pickups trucks.
In active shooter cases like these, it can sometimes take too long for professional EMS to arrive.
In the wake of Las Vegas, classes for people like us centered around the Department of Homeland Security's stop the bleed program are becoming even more popular.
They teach proper tourniquet usage, how to pack a wound with gauze, and even how to help a victim stay calm.
"The paramedics may not be able to get there quickly,” says paramedic Justin Harper. “And the reality is somebody can die within 5-10 min and if its really severe bleeding it can be less than 5 min, it can be 3 minutes."
Marilyn Newell, Class participant "We just need to be prepared anywhere that we are. To save somebody's life if we can," says Marilyn Newell, who has taken the class.
Some classes have waived the usual $25 fee in response to the Las Vegas shooting.
You can find classes in your area through their website.