"22,000 feet on the Rupal Face, Nanga Parbat, Pakistan: August 15, 2004. I take a deep breath and push the honed edge of the knife against the rope. It doesn't cut. I whetted the edge for just this reason. Frustrated, I look at the small knife in the palm of my mitten. I have carried this knife upwards for four days, on a climb where every ounce counts both towards and against my own survival. The rope is sacred, both a symbol and the truest expressio...