Because it's there: George Mallory attempts the climb -- On top of the world: Tenzing Norgay reaches the top -- The red flag in the summit snow: Chinese expedition finds new ways -- Everest by fair means: Reinhold Messner marches to his own drumbeat -- Kangshung Face: the east side story: American team tries the other side -- Everest for everyone?: Rob Hall and Scott Fischer's groups face deadly storm.