Dr. Kirk Yeager, the FBI's chief explosives scientist, works to understand bombs, bombers and the conditions that allow them to thrive to prevent future disasters.

The 'Unabomber' killed 3 people and injured more than 20 others during his mail-bombing campaign. What's his life in prison like today?

What did the killer do in the days before being executed for the murder of 168 people? What was his last meal, last words and last activities?

Tom Stankiewicz, commander of the Erie bomb squad who responded to the 2003 'Pizza Bomber' case, tells us how bomb squads operate and what new tools his team started carrying after the Brian Wells case.

To better understand package bombs and the serial bombers who employ them, like Austin serial bomber Mark Conditt, A&E True Crime spoke with Tina Sherrow, a retired bomb technician and certified explosives specialist for the ATF.