Jeff Wise is a science writer, outdoor adventurer, and author of "Extreme Fear." He explains to Bear Grylls exactly what's happening to the body during the adrenaline rush.
Roller Derby: Girls on Wheels
Nashville: Beyond Country Music
Meet me in Monaco
Robben Island Revisited
The British Charm of Victoria, B.C.
Cruising through Curacao
Deadliest Catch: Difficult Ditch
Mooving through Vermont
Canyon de Chelly National Monument, Arizona
National Parks: Black Bears Up Close
Cumberland Island, Georgia
St. Michaels on the Chesapeake Bay