A bipartisan coalition of 42 US state attorneys general served OpenAI a sweeping subpoena on 12 June 2026, demanding documents on sycophancy, child safety, health data, and user retention — four days after OpenAI filed its confidential IPO. Simultaneously, the UK’s Nerve Lab is using wearable MEG brain scanners to study what social media does to children’s neural development. Here is the full story.