The Download: reawakening frozen brains, and the AI Hype Index returns Plus: OpenAI has abruptly pulled the plug on AI video generator Sora. This is today's edition of The Download, our weekday newsletter that provides a daily dose of what's going on in the world of technology. This scientist rewarmed and studied pieces of his friend’s cryopreserved brain L. Stephen Coles’s brain sits in a vat at ...