Atop Humphrey’s Peak — Flagstaff, Arizona, the views are dazzling! Air loses 1/30th of its density with each 900 feet of altitude gained. At 12,643 feet we looked through air not just humidity free, but it had lost nearly half of its weight in oxygen and carbon dioxide. We gazed into the Grand Canyon, and the Painted Desert’s multihues flared-up through the transparent air. It was clear why the Hopi Indians believe that their Kachina gods reside up here, in an elevated environment, very close to home.