It's been a half century since Edmund Hillary and Sherpa Tenzing made the first ascent of Everest. Their success capped a thirty-year struggle that cost more than a dozen lives--and touched off a new era in the history of the mountain. The past fifty years have seen Everest become an even greater magnet for adventurers--both foolish and heroic. Some of the world's best climbers have carved out incredibly dangerous new routes on the peak, and many...