Alex Chadwick was lost. It took a journey to an unlikely place — the whitewater rapids of a Utah canyon — for him to find his way back to radio. In 2008, Chadwick found himself absent from the airwaves for the first time in decades. He had stepped down as host of the NPR show Day to Day to return to reporting, only to be laid off a month later, an unceremonious end to 31 years at the network. He then devoted himself to caring for his wife and partner in broadcasting, Carolyn Jensen Chadwick, who was battling multiple myeloma, a cancer of the blood cells.