Elon Musk says Neuralink has implanted its device in a second trial patient, who had a spinal cord injury, and 400 of the implant's 1,024 electrodes are working (Rachael Levy/Reuters)

Rachael Levy / Reuters:
Elon Musk says Neuralink has implanted its device in a second trial patient, who had a spinal cord injury, and 400 of the implant's 1,024 electrodes are working  —  Neuralink has successfully implanted in a second patient its device designed to give paralyzed patients the ability …