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In this episode, Audrow Nash interviews Peter Adamczyk, Assistant Professor at the University of Wisconsin-Madison, on semi-active foot and ankle prostheses. The difference is that active below-knee prostheses work to move the person\u2019s weight, emulating the calf muscle, while semi-active devices use small amounts of power to improve the performance of the prosthesis. Adamczyk discusses the motivation for semi-active devices and gives three examples: shiftable shapes, controllable keels, and alignable ankles.