Read how the dedicated agents of the FBI do their jobs--learn about their training, their history, and their scientific tools.

With lives hanging in the balance, paramedics use their training, skill, and ingenuity to come through in the clutch. Whether it's a heart attack, a car accident, a shooting, or just someone having trouble, these real-life heroes come through. Inside, find out how they do their jobs, whenever they get the call.

When police need to get close to the criminals they pursue, they call on undercover officers. These special experts learn how to "become" a criminal to infiltrate and gather information. It's an intense job that could end in death at any second. Inside, read how officers train for this unique part of law enforcement, the dangers they face, and how their work has been so successful.

The U.S. Secret Service includes agents and officers who put their lives on the line to keep our leaders safe, and others who work around the clock to prevent counterfeiters from wreaking havoc. Inside, find out more about one of America's oldest security agencies and learn the secrets to their success.