Sen. John McCain, the 2008 Republican presidential nominee, Vietnam prisoner of war and political maverick in Congress for more than three decades, has been diagnosed with an aggressive type of brain tumor.
The Grand Canyon’s rim-to-rim trail is not an ordinary day hike: a marathon in distance, a mile change in elevation, through a desert that swings through extremes of heat and cold. Rim-to-rim hikers put their bodies through a grueling experience. That makes them the perfect candidates for a study aimed at predicting medical emergencies before they start. KNAU’s Melissa Sevigny reports.