In 2020, a curious trend went viral on social media, especially among teenagers and young adults. As much of the world stayed at home to curb the spread of COVID-19, Reality Shifters began claiming they could move from one reality to another, referencing multiverse theory.

Beyond the actual possibility of switching between realities, this craze raised intriguing questions about the fabric of the reality we experience. Philosophers and scientists have long speculated about the existence of multiple realities. Today, Matthew Syed explores the blurry line between what we perceive as reality and what may lie beyond it, inviting us to question the very nature of existence.

With Reality Shifter Kristin Dattoo, clinical psychologist Professor Eli Somer, neuroscientist Professor Anil Seth, and theoretical physicist Professor Ulf Danielsson.

Presenter: Matthew Syed Producer: Julien Manuguerra-Patten Series Editors: Georgia Moodie and Max O'Brien Sound Design and Mix: Daniel Kempson Theme music by Ioana Selaru A Novel production for BBC Radio 4

Sideways returns with seven new stories of seeing the world differently and the ideas that shape our lives. Stories about everything from the ethics of using AI to simulate conversations with the dead to viewing decay as a vehicle for rebirth. Listen to the eleventh series of Sideways first on BBC Sounds.

Presenter: Matthew Syed Producers: Julien Manuguerra-Patten, Vishva Samani and Caroline Thornham Series Editors: Georgia Moodie and Max O'Brien Sound Design and Mix: Daniel Kempson and Nicholas Alexander Theme music by: Ioana Selaru Produced by: Novel for BBC Radio 4

Geoffrey Hinton's work laid the foundation for today's artificial intelligence systems. His research on neural networks has paved the way for current AI systems like ChatGPT.

In artificial intelligence, neural networks are systems that are similar to the human brain in the way they learn and process information. They enable artificial intelligence to learn from experience, as human beings would.

But Geoffrey Hinton has warned that machines could one day outsmart humans. He has even warned that autonomous weapons could be active on the battlefields of the future. In this final episode of 25 Years of the 21st Century, Matthew Syed interviews Professor Hinton.

Historian and author Margaret MacMillan and Baroness Joanna Shields also join Matthew in discussion. Baroness Shields has been working in the field of technology for forty years, holding senior roles at both Google and Facebook. She was the UK’s first Minister for Internet Safety and Security. She’s also a Conservative life peer in the House of Lords. Does she agree with Geoffrey Hinton's concerns for the future?

For 25 Years of the 21st Century, is this the age of artificial intelligence?

Production team Editor: Sara Wadeson Producers: Michaela Graichen, Marianna Brain, Emma Close Sound: Tom Brignell Production Co-ordinators: Janet Staples and Katie Morrison

Archive Steve Jobs launches the Apple iPhone, 2007

As we swipe to find love and consult chatbot therapists, Matthew Syed asks how technology has altered the way we approach dating, friendship and community.

It’s not all technology, though. Key changes in social trends, medical innovations, demography and economic factors have also played a part in how people live. How have relationships changed in the past 25 years?

Contributors Margaret MacMillan, Emeritus Professor of International History at the University of Oxford and author of several acclaimed books. Meghan Nolan, an Irish novelist and journalist based in New York. Sarah Harper, Professor of Gerontology at the University of Oxford and a fellow at University College.

Production team Editor: Sara Wadeson Producers: Emma Close, Marianna Brain, Michaela Graichen Sound: Tom Brignell Production Co-ordinators: Janet Staples and Katie Morrison

Archive Steve Jobs launches the Apple iPhone, 2007

Is this the age of outsourcing?

This is not a show about call centres in India. Rather, it's a look at a much deeper shift in who we are, how we think, and where value is created. In some ways, it's the most dizzying and philosophical shift of all.

In this episode, we attempt to understand outsourcing at the macro level - how corporations have outsourced so much that they’ve become hollow. And we look at the micro level - how we've outsourced our minds and memories to technology.

Contributors Margaret MacMillan, Emeritus Professor of International History at the University of Oxford and author of several acclaimed books. James Williams is an author and technology advisor. He worked for Google for more than 10 years where he received the Founders Award for his work on search advertising. He's the author of Stand Out of Our Light: Freedom and Resistance in the Attention Economy. John Key is author of The Corporation in the 21st Century. He's a visiting professor at the London School of Economics and a columnist for the Financial Times.

Production team Editor: Sara Wadeson Producers: Emma Close, Marianna Brain, Michaela Graichen Sound: Tom Brignell Production Co-ordinators: Janet Staples and Katie Morrison

Archive Steve Jobs launches the Apple iPhone, 2007

Have we lost faith in institutions, politicians - and even money?

Some people say there is an onslaught of misinformation and a battle for truth. So who do we trust now?

In this series, we’re remembering some of the big events of this century and asking how they’re shaping us.

Matthew is joined by Margaret MacMillan a historian and author, Rachel Botsman the author of three books on trust and Helen Margetts, a Professor of Society and the Internet at the University of Oxford.

Production team Editor: Sara Wadeson Producers: Marianna Brain, Emma Close, Michaela Graichen Sound: Tom Brignell Production Co-ordinators: Janet Staples and Katie Morrison

Archive Steve Jobs launches the Apple iPhone, 2007

In this series, we’re remembering some of the major events of this century and asking how they’re shaping us. This programme is all about war and conflict: from the events of September 11th 2001, to war in Afghanistan and Iraq. We're also looking at artificial intelligence on the battlefield. Where might that take us?

Matthew is joined by historian and writer Margaret MacMillan, former Chief of the Defence Staff Sir Nick Carter and author, Professor Anthony King.

Production team Editor: Sara Wadeson Producers: Marianna Brain, Emma Close, Michaela Graichen, Arlene Gregorius Sound: Tom Brignell Production Co-ordinators: Janet Staples and Katie Morrison

Archive Steve Jobs launches the Apple iPhone, 2007

Matthew Syed asks what it means to be distracted in a media world vying for our attention.

In this final episode, he considers where our media consumption might be headed. Many are concerned about smartphone addiction and a disintegration of public discourse, but others see a brighter future and our current times as a turning point to a world where the capacities of technology are used to benefit of society.

Matthew speaks to a former tech engineer who has become a philosopher and activist on attention, a historian who believes that our current era has many precedents, a psychologist who is wary of headlines about collapsed attention spans and a behavioural economist who can see a way that our society will adapt to the digital world.

Contributors:

James Williams, author of Stand Out of Our Light: Freedom and Resistance in the Attention Economy Matthew Sweet, Historian and Broadcaster Professor Pete Etchells, Psychologist, Bath Spa University and author of Unlocked: The Science of Screen Time and How to Spend it Better Michael Muthukrishna, Associate Professor of Economic Psychology and author of A Theory of Everyone: The New Science of who we are, how we got here and where we are going.

Presenter: Matthew Syed Producer: Sam Peach

Matthew Syed asks what it means to be distracted in a media world vying for our attention.

In this episode Matthew traces the inexorable rise of shortform video and investigates its success. He asks what the increasing popularity of this type of media might mean for our attention and finds out about the people using for purposes that may have surprised Neil Postman.

Apps such as Tik Tok, Youtube and Snapchat are ubiquitous and for many have become the chief way that they consume media. What does watching shorter videos mean for the content, and how do these apps change our habits and possibly, our brains?

The popularity of this medium has driven traditional institutions that are concerned with public affairs to embrace shortform video. So what's the result? Matthew finds out.

Contributors:

Dr Zoetanya Sujon, University of the Arts London Dave Jorgenson, Senior Video Journalist, Washington Post. Communications and Media Society, University of Liverpool

Presenter: Matthew Syed Producer: Sam Peach

Matthew Syed asks what it means to be distracted in a media world vying for our attention.

In this episode, Matthew analyses the medium through which we consume so much our media, the smartphone, and asks how whether it changes the nature of how we read, watch and interpret the world around us.

Matthew looks into the culture of smartphone use around the world and finds out what we can interpret from the growing use of the devices, particularly among younger generations. He looks into the technological advancements in the smartphone that have driven the most change, and considers how information consumption on a phone changes our approach to attention as opposed to the television or a book.

Contributors:

Gloria Mark, Chancellor's Professor of Informatics at the University of California, Irvine and author of Attention Span: Finding Focus for a Fulfilling Life Daniel Miller, Professor of Anthropology, University College London

Presenter: Matthew Syed Producer: Sam Peach

Matthew Syed asks what it means to be distracted in a media world vying for our attention.

In this episode, Matthew looks into history to uncover different approaches to focus. He finds out where the idea of 'attention' came from, whether there has always been a fear that humanity's ability to focus was declining, and what the historical relationship of technology to distraction has been.

He hears from the historian of science D Graham Burnett. Burnett has explored different philosophies of attention across the ages and is an advocate for a change in behaviours regarding our attention today. Professor Nilli Lavie, of University College London's Attention Research Laboratory, provides an insight into modern scientific views of attention.

Matthew looks for answers in a community renowned for their ability to focus...monks. Historian Jamie Kreiner has uncovered how early Christian monks thought about distraction in her book 'The Wandering Mind'. Jamie reveals that there is more to connect the monks of the first millennia with our technological world today than we might think.

Presenter: Matthew Syed Producer: Sam Peach