Day 6

The benefits of being afraid

Sociologist and fear aficionado Margee Kerr tests her limits by visiting some of the scariest places on the the planet.
A reporter leans over the edge of the catwalk during the media preview for the "EdgeWalk" on the CN Tower in Toronto, July 27, 2011. REUTERS/Mark Blinch (Mark Blinch/Reuters)

From the hands-free CN Tower EdgeWalk that lets you walk around 116 stories above Toronto, to a night spent in "the hole" at Pennsylvania's Eastern State Penitentiary sociologist and fear aficionado Margee Kerr isn't afraid to test her own limits. And she does just that for her new book "Scream: chilling adventures in the science of fear."

Since 2008, Margee has worked at Pittsburgh's ScareHouse haunted house observing and studying the reactions of terrified visitors through discreet peepholes. But this time she confronted her own fears of physical stress, danger, and death. Brent talks to Margee about her scariest experiences and what she learned about herself in the process.