Hawking saw the world on the brink of a "vast transformative change" when he died, she noted, adding: "He's asking us not to go into the future blindly".
Although Hawking was known for his work on cosmology and black holes, his final book is a "reflection of his humanity" and his hopes that unsafe new technologies could not just destroy, but also unite and revolutionise human life.
The famously atheistic professor also discourages the temptation of humans to play God. Thus they can modify their DNA and their children, improve memory and resistance to disease, and life expectancy and improve intelligence.
Hawking insisted that "once such superhumans appear, there will be significant political problems with unimproved humans, who won't be able to compete".
Professor Stephen Hawking envisioned a world of "superhumans" in his final prediction before he died seven months ago.
And that super race could ultimately destroy the rest of humanity, according to The Guardian, which viewed the essay.More news: Hate crime offences up 17% in England and Wales
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This two-tier system of humans, Dr Hawking predicted, could have grave social consequences.
"It's tempting to dismiss the notion of highly intelligent machines as mere science fiction, but this would be a mistake - and potentially our worst mistake ever". He cited the election of US President Donald Trump and Britain's 2016 vote to leave the European Union as part of "a global revolt against experts and that includes scientists". "That at a time when we should be calling for unity we were becoming more and more fractured and divided".
While primitive forms of artificial intelligence developed so far have proved very useful, I fear the consequences of creating something that can match or surpass humans. "On this basis the future looks desperately gloomy", he said. There is no way that people are going to take this any less seriously than they are supposed to. Professor Hawking received over a dozen honorary degrees ... "We stand on a threshold of a courageous new world".
"The real risk with AI isn't malice, but competence".
Hawking was still working as director of research at the Centre for Theoretical Cosmology at the University of Cambridge in England at the time of his death.
As he's discussed before, that dubious honor likely falls to a super-intelligent AI with risky capabilities and goals that do not align with those of humans - or some kind of planetary disaster that extinguishes life on Earth before humans have had a chance to jump ship. "Do we really want cheap A.I. weapons to become the Kalashnikovs of tomorrow, sold to criminals and terrorists on the black market?"