Bionic arms are beginning to tap into nerve signals that linger long after a limb is gone, turning the ghost of movement into real, controllable action. Instead of relying on crude muscle twitches or ...

When Andrii Gidzun and Vitalii Ivashchuk lost limbs fighting the Russian invaders of their country, the Ukraine-based Superhumans Center fitted them with 3D-printed “bionic” prostheses, robot arms ...