In this article, the author, a Forest School Leader with Shropshire Wildlife Trust, shows how nature is the best teacher. She describes a new approach to out-of-classroom learning during which qualified leaders use simple challenges and achievable tasks to encourage child-initiated learning in the great outdoors. At Forest School, children are given the time and space to play in the woods, to throw armfuls of leaves in the air or watch them falling from the trees, or to lie on their backs and watch the clouds. A study in Sweden examined the social benefits to children of taking part in a Forest School. It found strong evidence that children become healthier and happier, they take fewer days off sick, have a longer concentration span and better coordination than those who remain inside for a more traditional education. (Contains 4 figures.)