The Download: urban drone deliveries, and our guide to AI regulations

The news: Brain signals can be used to detect how much pain a person is experiencing, which could overhaul how we treat certain chronic pain conditions, a new study has suggested. Electrodes implanted in the brains of four people living with chronic pain helped researchers to track their individual levels of pain, and to train an AI model to accurately predict its severity. Why it's important: Because we still don't really understand how chronic pain affects the brain, it's very difficult to treat. This research is the first time a human's chronic-pain-related brain signals have been recorded, and it could aid the development of personalized therapies for the most severe forms of pain. Meta's new AI models can recognize and produce speech for more than 1,000 languages What's happened: Meta has built AI models that can recognize and produce speech for more than 1,000 languages--a tenfold increase on what's currently available.