In January, U.S. bitcoin miner Core Scientific was bankrupt and battling angry lenders. Since its return to the stock market that month, the share price is up 140% as the company aggressively goes after building a business in artificial intelligence. On Tuesday, the mining firm announced an expanded deal worth $6.7 billion with CoreWeave, an Nvidiabacked startup that's one of the main providers of the chipmaker's technology for running AI models. Core Scientific will deliver an additional 112 megawatts of c ...