Minus 50 degrees Celsius is a challenge for human beings who were not raised in the Arctic, becoming familiar with polar bears and dog sleds. Plus 50 degrees Celsius is part of a nomadic reality, of survival in the desert, short of water and shadow, but rich in stars above and vicious vipers in the sand. Eskimos, known as Inuit and Yupik, and Bedouins and Tuaregs, indigenous people, survive by trusting instinct and their embrace of nature, strengthened throughout childhood by cod li ...