Elon Musk has unveiled plans to implant computer chips in people's brains that the US billionaire says will treat brain diseases and enable superhuman intelligence. Neuralink, a secretive company set up by Mr Musk two years ago, has said it plans to begin tests of its "brain-computer interface" technology on humans in the next year. Mr Musk, 48, the chief executive of Tesla and SpaceX, said the technology will help "solve brain disorders of all kinds" and allow humans to merge with artificial intelligence. It has so far been tested on monkeys and rats, he said. The tiny chip, which measures 4x4mm, is connected to a thousand microscopic threads that enter the brain through four holes drilled in the skull.