Musk Rebuilds xAI From Scratch, AI Designed a Cancer Vaccine for a Dog, Meta’s Big Layoffs

Today we’re covering the biggest AI stories of March 16th, 2026. Elon Musk publicly admitted xAI “was not built right” and is being rebuilt from the ground up — with 9 of 11 original co-founders now gone, Grok’s coding lead reportedly pushed out, and the company racing to replace lost talent with senior hires from Cursor. A Sydney consultant with no biology background used ChatGPT, Grok, and AlphaFold to design a custom mRNA cancer vaccine for his rescue dog Rosie — and one of her tumors shrank by half after the first injection. Plus, Meta is reportedly planning layoffs that could cut 20% of its nearly 79,000-person workforce as AI infrastructure costs spiral toward $600 billion, and a community workflow from a deal hunter who built a personal AI operating system to evaluate businesses for acquisition.