Elon Musk has called on top AI labs and Chinese companies to cross-test their systems. He delivered that message while some people in the technology industry are asking for more caution around AI. Musk himself has major AI investments. Tesla shares slid following the speech. Musk also was listed at the head of Forbes' annual ranking of the wealthiest Americans. He again raised the idea of combining Tesla and SpaceX. On another front, reports say sexually abusive imagery of children continues on X, even though Musk committed to fixing it.