open letter
... that Stephen Hawking, Elon Musk, and top artificial intelligence experts have penned an open letter urging AI researchers not to create anything that can't be controlled?
... that <a href="./Stephen_Hawking" id="mwCcg" rel="mw:WikiLink" title="Stephen Hawking">Stephen Hawking</a>, <a href="./Elon_Musk" id="mwCck" rel="mw:WikiLink" title="Elon Musk">Elon Musk</a>, and top <a href="./Artificial_intelligence" id="mwCco" rel="mw:WikiLink" title="Artificial intelligence">artificial intelligence</a> experts have penned an <b id="mwCcs"><a class="mw-redirect" href="./Open_Letter_on_Artificial_Intelligence" id="mwCcw" rel="mw:WikiLink" title="Open Letter on Artificial Intelligence">open letter</a></b> urging AI researchers not to create anything that can't be controlled?