Living like a nomad

American journalist Erik Nilsson milks yaks, collects dung and herds sheep with slingshots to discover firsthand what it's like to survive on the frosty Qinghai-Tibet Plateau.

Yaks buck. I learned this when I mounted one year ago while camping with a nomad beneath a glacier in Yushu Tibetan autonomous prefecture's Qumarleb county.

I clutched the creature's wool and held on for dear life.