BlueAppleTeacher.org | 616.234.5528 BLUE APPLE SNEAK PEEK For more strategies from the PBL Unit State of Sustainability, and to explore other projects, visit BlueAppleTeacher.org! Kid-Safe Search Sites Love that your students are interested in researching, but hate the inappropriate content they find when searching online? The Blue Apple project, State of Sustainability, solved that conundrum by compiling a list of Kid-Safe Search Sites, just for you!