"When Tenzing was young, he spent much of his childhood tending to the family's yaks and gazing up at the Himalaya mountains, dreaming of the day he would reach the top. Once he grew up, he joined many other Sherpas who were offering to take Europeans up the highest mountain of all--Chomolungma or Everest. It was the chance he needed to make his childhood dream a reality. He went on many expeditions, some more dangerous than others, but Tenzing never...