Elon Musk has urged top AI labs and Chinese companies to cross-test their systems. He made the appeal while various industry voices are calling for a pause in AI development. Musk himself has put large sums into AI companies. Tesla shares fell following the speech. Musk also was listed at the top of Forbes' annual ranking of the wealthiest Americans. He brought up once more his proposal to merge Tesla and SpaceX. On another front, reports say abusive material involving children remains on X, even though Musk committed to fixing it.