When Jon Krakauer reached the summit of Mt. Everest in the early afternoon of May 10,1996, he hadn’t slept in fifty-seven hours and was reeling from the brain-altering effects of oxygen depletion. As he turned to begin the perilous descent from 29,028 feet (roughly the cruising altitude of an Airbus jetliner), twenty other climbers were still pushing doggedly to the top, unaware that the sky…
