Unlock the Editor’s Digest for freeRoula Khalaf, Editor of the FT, selects her favourite stories in this weekly newsletter.Elon Musk’s artificial intelligence start-up xAI has pledged to expand its Colossus supercomputer tenfold to incorporate more than 1mn graphics processing units, in an effort to leap ahead of rivals such as Google, OpenAI and Anthropic.Colossus, built in just three months earlier this year, is believed to be the largest supercomputer in the world, operating a cluster of more...