Second graders in Ms. Gibson’s class studied innovations and inventors as part of Benchmark Unit 5, "Solving Problems through Technology." After brainstorming a list of problems people have, each student selected a problem and designed a robot to solve that problem. Then they shared their idea with a peer, who gave them constructive feedback. Full of fresh ideas and insights from their collaboration, they sketched out a diagram of their robot with labeled parts. Next, they created a 3-D prototype based on the diagram  using Tinkercad and a 3-D printer. Seeing their robot in 3-D helped them revise and improve their designs. Finally, students published a written manual for their robot, with a reflection on what they learned.