By Michael Lanza
The heat presses in from all sides as we hike down the Bill Hall Trail off the North Rim of the Grand Canyon. The overhead sun feels as if it has expanded to a supernova threatening to engulf the planet. The rocks radiate waves of heat up at us; I wonder if they might actually reach egg-frying temperature today. Even the air seems to be rising to a boil like a vast kettle on a stove. We hike cautiously over broken stones that slide underfoot, leaning out onto our trekking poles for the two- and three-foot ledge drops on this path—which appears better suited to bighorn sheep than to bipedal primates hauling backpacks weighed down with gear, food, and a surplus of a rare element out here: water.