ROTTUNG, Arunachal Pradesh—I’m standing, weak-kneed, midway across the gorge of the Siang River, one of the three tributaries that converge to form the Brahmaputra River. Treading slowly over a bamboo suspension footbridge 300-odd meters long and just a meter wide, I marvel at this premodern engineering by the Adi Minyong tribe that dominates this section of Arunachal Pradesh. Read More