Marco Antonio Nina, 26, who lost his left arm at the age of 14 in a work accident, tests his bionic arm prosthesis that Roly Mamani made for him in his "Robotics Creators" workshop in the town of Achocalla, 18km from La Paz, Bolivia on January 8, 2024. Electrical engineer and robotics expert Roly Mamani has delivered more than 400 prostheses across Bolivia to poor and rural people, charging them only for the cost of the materials used to make the prostheses. (Photo by JORGE BERNAL / AFP)