17-year-old boy builds 'mind-controlled' robotic arm in US, pic surfaces

A 17-year-old from Virginia in the US has invented a robotic prosthetic arm that can be controlled by the mind. Benjamin Choi used his sister's 3-D printer and some fishing line to print individual parts of the arm and then bolted them all together. It uses an artificial intelligence (AI) algorithm to interpret the user's brain waves.