Elon Musk is pressing major AI research groups and Chinese companies to run checks on other labs' systems. He made the appeal while some in tech are asking for a slowdown in AI work. Musk himself has put large sums into AI companies. Tesla stock slid after his remarks. Musk also appeared at the head of Forbes' annual ranking of the wealthiest Americans. He again raised the notion of joining Tesla and SpaceX. On another front, reports say sexually abusive imagery of children continues on X, even though Musk vowed to tackle it.