Mac users are no longer immune to an increasingly popular type of virus, researchers say.

A Ransomware virus, which locks files on a victim’s computer unless the user sends hackers money, has affected Apple’s desktop operating system for the first time,

Apple has taken steps to make it impossible to install the affected app.

The discovery is particularly noteworthy because Apple’s desktop operating system isn’t usually susceptible to such attacks.

Mac users are therefore advised to make sure they do not download suspicious programs online.

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Artificial intelligence is getting smarter by leaps and bounds — within this century, research suggests, a computer AI could be as "smart" as a human being. And then, says Nick Bostrom, it will overtake us: "Machine intelligence is the last invention that humanity will ever need to make."

A philosopher and technologist, Bostrom asks us to think hard about the world we're building right now, driven by thinking machines. Will our smart machines help to preserve humanity and our values — or will they have values of their own?

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