“I don’t want to jinx it, but it seems to have gone extremely well with the second implant,” Elon Musk said on the Lex Fridman podcast. “There’s a lot of signal, a lot of electrodes.” The wires on Neuralink’s first human brain implant retracted, resulting in fewer electrodes that could measure brain signals. 10 more implants could come before the end of this year if regulators approve.