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Does artificial intelligence pose a threat to our existence? Recent warnings from the likes of Professor Stephen Hawking that AI could mean the end of humans have worried some. But are those in control of technological innovations aware of the power they have? And is there a danger of a Silicon Valley "God complex"? Zoe Kleinman looks at machines and mortality, and whether religion has a part to play in technology.

We hear from Michael Malone, author, investor and Silicon Valley insider, and John Graham-Cumming, programmer and author of the Geek Atlas.