Elon Musk is working with scientists on his start-up Neuralink to demonstrate his ambitious plans to create a working brain-to-machine interface. It recently displayed their trial with a pig called Gertrude that has a coin-sized computer chip in her brain. The processor in Gertrude’s brain sends wireless signals showing neural activity in her snout when searching for food. The system is still undergoing clinical experiments as the real challenge for the technology is the complexity of how the brain works. Neuralink applied to launch human trials last year.