>> nice to see you. you look great. >> thank you. hi. >> how are you? >> good. >> you look amazing. >> thanks. i wasn't quite as mobile. >> amazing. >> yeah, right. >> this is my new home away from home. i moved from a dance studio to m.i.t. hey! how's it going. >> hi, anderson, nice to meet you. what are you doing today. >> we have a bionic limb that we are designing for dance and will sense that adrien is on her toe and spinning and stiffen the ankle in the right way. >> this is an incredible piece of machinery. it's awesome. what are the different parts. >> so your calf muscle is basically the motor in here. that goes to the achilles tendon, which is represented by this black spring. >> wow. >> and then there's computers on board that control that calf leg muscle in the same way that your spinal cord controls your calf. >> can we dance now? >> let's do it.