Prosthesis is nothing new but the 3D printing and robotics have made it both more accessible as well as more advanced. But what if you don’t have any missing limb or body part? What if you just wanted to add one more? That’s the very question that Dani Clode from UK’s Royal College of Art is trying to answer. And her first answer comes in the form of a thumb that you can attach to your hand and control with your feet.