Elon Musk’s brain-computer interface (BCI) startup, Neuralink, has evidently begun its second human trial. The news came during an episode of the Lex Fridman podcast wherein Musk unceremoniously revealed that the second human trial was successful, “so far so good.” Musk went on to say that the second implant was functioning properly with about 400 electrodes “providing signals.” Neuralink’s brain-computer interfaceBrain-computer interfaces are electronic devices that allow humans to communicate with computers using their thoughts. While it might sound like science fiction, BCIs have been aroun…