Elon Musk has called on top AI labs and Chinese companies to test each other's models. He issued the request while some people in the technology industry want a pause in AI development. Musk himself has major AI investments. Tesla stock dropped after his remarks. Musk also was listed at the top of Forbes' annual ranking of the wealthiest Americans. He again raised the notion of joining Tesla and SpaceX. On another front, reports say child sexual abuse material continues on X, even though Musk vowed to tackle it.