“Come to the woods, for here is rest,” wrote John Muir,the 19th Century Scottish-American naturalist who was one of the earliest advocates of US national parks. Muir spent large chunks of his life exploring Yosemite and the Sierra Nevada, and wrote abundantly of his belief in nature’s nourishing role,saying:“Everybody needs beauty as well as bread, places to play in and pray in, where nature may heal and give strength to body and soul alike.”