Every day, the path up the South Col route to the summit of Everest becomes a little more worn by the tread of dozens of package-tour climbers, but few dare to try the East, or Kangshung, Face, a sheer, avalanche-swept wall of snow and ice only first conquered in 1983. Five years later, Stephen Venables intensified the challenge by leading three unknown American climbers up the East Face - this time without oxygen. The question to most climbing experts...