When Eugenia Kuyda created Replika, the AI companion app, she had no idea it would be downloaded millions of times all around the world. The results were more powerful than she could ever have predicted. But so was the backlash

For the past six months, Guardian journalist Michael Safi has been trying to find out who is behind an AI company that creates deepfakes. Deepfakes that are causing havoc around the world, with police and lawmakers baffled about how to deal with them. And in trying to answer one question, he has been left with a bigger one: is AI going to make it impossible to sort fact from fiction?

This is the story of Geoffrey Hinton, a man who set out to understand the brain and ended up working with a group of researchers who invented a technology so powerful that even they don’t truly understand how it works. This is about a collision between two mysterious intelligences – two black boxes – human and artificial. And it’s already having profound consequences

The beginning of a new series that explores seven stories and the thread that ties them together: artificial intelligence. In this prologue, Hannah (not her real name) has met Noah and he has changed her life for the better. So why does she have concerns about him?

In rural Norway, a young woman’s boyfriend forgets who she is overnight. In Detroit, a man is arrested for a crime, but he was never there. In a Spanish town, disturbing pictures of young girls have appeared, but no one knows who is behind them. In this new series from the Guardian, we’ll explore what it is that connects all these stories: the collision between people and artificial intelligence. Coming soon …

Guardian producer Lucy Hough and reporter Matthew Weaver give an update on the outcome of Matthew Hardy’s appeal

As the years tick by, journalist Sirin Kale speaks to victims and those who know Matthew to ask whether his stalking will ever truly end

Journalist Sirin Kale meets Matthew’s mother to uncover more about his past, and find out what might have motivated him to cyberstalk his victims for so many years

Matthew’s victims come face to face with him as an attempt is made to stop his torment once and for all

Who is Matthew? Journalist Sirin Kale looks for clues about who this cyberstalker really is and why he creates chaos and fear in so many people’s lives