This content can also be viewed on the site it originates from. Last summer, the science-fiction writer Kim Stanley Robinson went on a backpacking trip with some friends. They headed into the High Sierra, hiking toward Deadman Canyon--a fifty-mile walk through challenging terrain. Now sixty-nine, Robinson has been hiking and camping in the Sierras for half a century. At home, in Davis, California, he tracks his explorations on a wall-mounted map, its topography thick with ink.