Think you've got first aid down pat? Think again. Much of what most people know about first aid comes from outdated practices, old wives' tales, or was passed down through generations of family until it became fact. And if your great-great-grandmother says you should pour hydrogen peroxide over a scraped knee, you believe her.

It's time to stop trusting your great-great-grandmother and start trusting first aid experts like Nici Singletary, MD, FACEP, a member of the American Red Cross Scientific Advisory Council. She gave us the low-down on 6 first aid mistakes people make all the time-and what to do instead.