Part memoir, part guide for parents to insert more hands-on nature activities into their children’s lives, The World Is Our Classroom, How One Family Used Nature and Travel to Shape an Extraordinary Education, by Cindy Ross, is an entertaining and eye-opening look at how much children can learn through experience, given the right environment and circumstances. Ross’s narrative is interspersed with journal entries from her daughter Sierra and son Bryce. Each chapter concludes with a “Nuts and Bolts” section, a “How-to” that can help parents teach similar lessons in a way that is right for them. Avid backpackers, Cindy Ross and her husband Todd had hiked thousands of miles before…