This is the story of Geoffrey Hinton, a man who set out to understand the brain and ended up working with a group of researchers who invented a technology so powerful that even they don’t truly understand how it works. This is about a collision between two mysterious intelligences – two black boxes – human and artificial. And it’s already having profound consequences. Help support our independent journalism at <a href="https://www.theguardian.com/infocus">theguardian.com/infocus</a>