As small boys, we were very shy about meeting tourists crossing though our valley, expedition sardar Ngawang Yonden Sherpa recalls. But at their heels, we enjoyed walking in the footprints that their heavy mountain boots left in the muddy ground, just to experience under our bare feet the feeling of the profiles of their rubber soles and imagine walking in their sophisticated mountain shoes. That was in the 1960s. The Sherpas of Rolwaling Valley in Eastern Nepal ...