Joan Horvath and Rich Cameron, authors of Make: Geometry, explain how to use 3D models to teach geometry, which can help students visualize and grasp the basic shapes. Joan describes herself as a recovering rocket scientist who worked at JPL. Rich was an early RepRap 3D printer enthusiast. Together they have created a practical, hands-on approach to teaching geometry. Make: Books editor, Patrick DiJusto talks to Joan and Rich.

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