The Download: a biological de-aging contest and why LLMs don't reason

Plus: OpenAI says rogue agents may have affected more than 100 organizations. This week, I officially signed up for an unusual competition. I recently turned 40, and I don't need reminding that both time and my chronological age only tick forward. But this game is focused on competitors', figures that are meant to provide a better way to measure the age-related health of our organs and bodies. Over six months, around 500 of us will try to reverse our biological age using a bunch of different measures. But is it even possible to measure whether someone is getting younger?