Daily Beast: One cold October day in 1968, I climbed out of a warm creek on the Yellowstone Plateau and came face to face with a huge grizzly. I froze, not knowing what to do. Since I was naked, my options were limited. I slowly turned my head and looked off to the side. The giant bear flicked his ears and, with unmistakable restraint, swung away and disappeared into the trees. Standing in the chill breeze of autumn, I knew something had passed between us.
That peaceful standoff with the grizzly was the first...