This article describes a hands-on activity and demonstration developed at the University of Washington and further reined at the University of New Mexico. In this activity, the authors present a real-world problem to the student: Someone has an injured finger joint, and the students in the class need to design an implant to replace it. After presenting the problem, the authors discuss how the students could go about making a replacement finger joint. In order to do this, the students need to understand what comprises a finger and consider what materials are available that match the properties of the components in a finger. As this is an engineering project, the authors ask students to develop design goals for the finger (e.g., that it is flexible, bends only in one direction, is able to pick up an object). (Contains 4 tables and 3 figures.)