aLONG the northeastern edge of the Tibetan plateau, a treacherous landscape where yaks graze above the clouds, basketball hoops are everywhere: at the bases of cliffs; in the courtyards of centuries-old, golden-roofed monasteries; in nomadic villages tucked into the hills.To hear more feature stories, see our full list or get the Audm iPhone app. It was within such a village, Zorge Ritoma, that Dugya Bum, a sheep and yak herder from the Golden Stone Clan, took up the sport. He’d played in school, but after dropping out at 16 he became a full-time nomad, the livelihood of his ancestors.