Sandbox 101 describes how using sandboxes in the classroom can engage students in history lessons. Students work in groups to build models in sandboxes that demonstrate their understanding of historical topics like trench warfare from World War 1. This hands-on activity allows students to directly apply their knowledge and receive feedback. It also serves as both a formative and summative assessment. The document provides examples of sandbox activities and assessments that align with the Ontario history curriculum, and discusses the benefits of using this strategy for differentiated instruction and student engagement.