The Natural Inquirer uses peer-reviewed, published research conducted by USDA Forest Service scientists and their collaborators to create a variety of journals, monographs, readers, and scientist cards. At their website, you can browse all publications, download materials, access lesson plans and other activities to accompany those materials — like Science Hours and distance learning modules — and order copies of any of their publications at no cost (not even shipping!). They also provide additional teaching materials like interviews about the scientific process with USDA Forest Service scientists, science fair resources, and a huge list of other online resources.