Elon Musk says Neuralink has successfully implanted a brain chip in a second human patient. The patient has used the chip to play video games and design 3D objects. Here's how Neuralink's chips work.

Jake Schneider, an ALS patient, was able to reconnect with the world through Neuralink, a brain-computer interface device that allows him to control a cursor on a screen and play video games with his ...