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Bear Grylls helps Keir Simmons conquer his fears


Bear Grylls is one of the world’s most recognized faces of survival and adventure, with hit shows such as NBC’s “Running Wild” and several best-selling books. To talk about his latest book, "How To Stay Alive," Grylls took NBC’s Keir Simmons to one of Keir's least favorite places: up high in the air.