On a cloudy, windy day in June 1887, Edgar Mearns climbed Mount Humphreys, Arizona's highest peak. Taking shelter behind a pile of stones, he was joined by a broad-tailed hummingbird—a fitting companion for one of America's greatest ornithologists.
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.