The Download: reawakening frozen brains, and the AI Hype Index returns

MIT Technology Review's newsletter covers cryobiologist Greg Fahy's research on rewarming pieces of a cryopreserved brain, aiming to advance brain study and organ transplantation. The AI Hype Index returns to separate AI reality from fiction, while Niantic Spatial leverages Pokémon Go crowdsourced data to build world models for robot navigation. Additionally, OpenAI has abruptly shut down its AI video generator Sora.