Facial recognition technology, you might think, belongs in a dystopian nightmare. Imagine cameras tracking your every move, knowing exactly who you are, everything you’ve done, what you like and who you meet. But it’s fiction no longer. Married with artificial intelligence (AI), the swarm of cameras perched on buildings and lamp posts the world over can now do all that and much, much more. And it won’t be long before the technology is everywhere.

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