The article highlights a lack of consensus within the AI community about the likely outcome of advanced AI, which prevents agreement on policies and leads the public and politicians to pay less attention to the issue. Discussions within the AI community sound like science fiction to most people, illustrated by an exchange between Andrew Ng, who in 2015 commented that worrying about superintelligence was like worrying about overpopulation on Mars, and Stuart Russell, who replied that failing to think about superintelligence is like travelling to Mars without a plan for breathing. The upshot is that most people outside the AI community and most politicians know far less about AI than they should. Within the community, ferocious debate includes the Doomers, who think the technology will cause great harm. Eliezer Yudkowsky's position is summarised by his book title, “If Anyone Builds It, Everyone Dies”, co-authored with Nate Soares. Other Doomers include the MIT physicist Max Tegmark and two of the three so-called “godfathers of AI”, Geoff.