Start the Week - Global influences

Ancient Greece and Rome loom large in the understanding of the roots of Western Civilisation, but the Professor of Ancient History Josephine Quinn wants to challenge that simple narrative. In How The World Made The West – A 4,000 Year History she shows how western values were developed by long-standing links between a much larger group of cultures, from the Gobi Desert to the Atlantic Ocean and beyond.

The British Museum’s major new exhibition Legion looks at life in the Roman army (on until 23rd June). This elite war machine was employed to protect and control around a quarter of the Earth’s population for over half a millennium. Recruits came from all walks of life, and from across the Empire. The archaeologist Carolina Rangel de Lima reveals the impact this extraordinary diversity of cultures and beliefs had on the imperial Roman army.

The writer Christopher Harding takes a closer look at the many ways in which Asia has influenced Europe and North America. In his book, The Light of Asia, he explores how Japan, China and India have often been sources of genuine fascination and artistic and intellectual inspiration, as well as confusion and misunderstanding.

Producer: Katy Hickman

The Gatekeepers - 2. Blitzscaling

From the rubble of the dot com crash, an ambitious young Harvard student with a passion for hacking and love of Roman emperors, sets up an exciting new website.

Mark Zuckerberg’s Facebook is an instant hit on college campuses.

Soon it attracts the attention of Silicon Valley’s most successful - but controversial - venture capitalist, Peter Thiel.

The company starts to scale up. But there’s one problem - how is it going to make money?

Contributors: Roger McNamee, author of Zucked: Waking up to the Facebook Catastrophe; journalist Owen Thomas; Eric Jackson, author of The Paypal Wars; Jeff Hammerbacher; Anil Dash, tech entrepreneur.

Producer: Caitlin Smith Researchers: Rachael Fulton, Elizabeth Ann Duffy and Juliet Conway Executive Producer: Peter McManus Sound Design: Eloise Whitmore Music: Jeremy Warmsley Story Consultant: Kirsty Williams Commissioning editor: Dan Clarke A BBC Scotland Production for BBC Radio 4

Archive: Bloomberg Quicktake, October 2019; C-Span, Telecommunications Bill signing, Feb 1996; Hoover Institute, Decemeber 2009; Startup Academy, March 2018; Makers, December 2012.

New episodes released on Mondays. If you’re in the UK, listen to the latest episodes of The Gatekeepers, first on BBC Sounds: bbc.in/3Ui661u

More or Less: Behind the Stats - The global gender split in young people?s politics

In a surprising new trend, young men and women around the world are dividing by gender on their politics and ideologies. Whilst young women are becoming more liberal, young men are becoming more conservative. Tim Harford speaks to John Burn-Murdoch, Columnist and Chief Data Reporter at the Financial Times, about why this global phenomena may be occurring and Dr Heejung Chung, Professor of Sociology at the University of Kent, explains why the ideological divisions between young men and women in South Korea are some of the most extreme.

Presenter: Tim Harford Producer: Debbie Richford Series Producer: Tom Colls Production Co-ordinator: Brenda Brown Sound Mix: Neil Churchill Editor: Richard Vadon

(Picture: A couple with their back to each other busy with their mobile phones Credit: Martin DM / Getty)

More or Less: Behind the Stats - Council tax weirdness: Hartlepool vs Westminster

Do you really pay more in council tax on a semi in Hartlepool than a mansion in Westminster? How do the Office for National Statistics work out how much the UK population is going to grow by? How much do junior doctor strikes cost? Is home grown veg worse for climate change than veg grown on a farm?

Tim Harford investigates the numbers in the news.

Presenter: Tim Harford Producers: Nathan Gower, Debbie Richford and Perisha Kudhail Series producer: Tom Colls Production co-ordinator: Brenda Brown Sound Mix: James Beard Editor: Richard Vadon

Start the Week - Opium trade to synthetic opiates

The trade in opium formed a backdrop to Amitav Ghosh’s best-selling novels, The Ibis Trilogy. In his latest work of non-fiction, Smoke and Ashes, he investigates the impact of that trade on Britain, India and China, and follows the money that was made by some of America’s most powerful and well-respected families. He reveals how the poppy plant enabled the financial survival of Empire and proved catastrophic for Indian farmers and Chinese users.

In the 21st century Afghanistan became the biggest grower of poppies, producing more than 80% of the world's opium. The former soldier, Richard Brittan, set up the company Alcis, to provide an accurate picture of what’s going on on the ground in Afghanistan by using satellite imagery. As well as tracking the workings of the drugs trade, he explains the impact of the Taliban ban on poppy cultivation in 2023.

Professor Fiona Measham, Chair in Criminology at Liverpool University, explains that one of the effects of the disruption to the opium trade has been a large increase in the number of synthetic opiates – fentanyl and nitazenes – filling the vacuum. China has become the centre for the wider development of synthetic drugs that emulate plant-based street drugs, but are much stronger and potentially lethal. The charity The Loop, set up by Measham, is instrumental in checking drugs to better understand what is being sold on the streets.

Producer: Katy Hickman

The Gatekeepers - 1. We Are as Gods

For years something strange has been happening online, but most of us have no idea what’s really going on.

Ethnic conflict in Myanmar. A chemistry professor is killed in Ethiopia. A teenager dies in her bedroom in London. A mob storms the Capitol in Washington DC.

And that’s the moment that catches Jamie Bartlett’s eye. A few days after the riot, on January 9th 2021, the outgoing leader of the United States is suspended on social media. First Twitter, (renamed X), and then Facebook. A President silenced. It’s a glimpse behind the curtain. For the first time millions of us can see the power of technology companies.

They can delete you. They can amplify you. They can change your life. Social media has conquered the world.

Jamie Bartlett follows the roots of this story back to San Francisco : the home of Big Tech, where he meets one of the early pioneers of social media who tells him about a strange hand bound book, passed around hippy communes in the summer of love, and how it turned the world upside down.

Archive Credits: Wolf of Wall Street, Paramount Pictures; Telecommunications Bill sign in, C-Span 1996; Bloomberg's TicTic 2019; Fox News 2020

Presenter: Jamie Bartlett Producer: Caitlin Smith Sound Design: Eloise Whitmore Music: Jeremy Warmsley Story Consultant: Kirsty Williams Researchers: Rachael Fulton, Elizabeth Ann Duffy and Juliet Conway Executive Producer: Peter McManus Commissioning editor: Dan Clarke. A BBC Scotland Production for BBC Radio 4

New episodes released on Mondays. If you’re in the UK, listen to the latest episodes of The Gatekeepers, first on BBC Sounds: bbc.in/3Ui661u

More or Less: Behind the Stats - A pocket-size history of the calculator

How was the calculator invented? How did it go from something the size of a table to something that could be carried in your pocket, the must-have gadget of the 1970?s and 80?s?

Tim Harford unpicks the history of the calculator with Keith Houston, author of Empire of the Sum: The Rise and Reign of the Pocket Calculator.

Presenter: Tim Harford Producer: Debbie Richford Production Co-ordinator: Brenda Brown Series Producer: Tom Colls Sound Mix: Hal Haines Editor: Richard Vadon

More or Less: Behind the Stats - Measles, Traitors and the cost of Brexit

Was there really a 5% measles vaccination rate in Birmingham? Has Brexit already cost 6% of the UKs economy? For how long has crime been falling? And are contestants on the reality gameshow any good at finding traitors?

Tim Harford investigates the numbers in the news.

Presenter: Tim Harford Producers: Nathan Gower and Debbie Richford Series producer: Tom Colls Production coordinator: Brenda Brown Sound mix: Rod Farquhar Editor: Richard Vadon

The Gatekeepers - Introducing The Gatekeepers

It all started with a crazy idea to realise a hippie dream of building a “global consciousness”. The plan was to build a connected world, where everyone could access everyone and everything all the time; to overthrow the old gatekeepers and set information free.

But social media didn’t turn out that way. Instead of setting information free – a new digital elite conquered the world and turned themselves into the most powerful people on the planet.

Now, they get to decide what billions of us see every day. They can amplify you. They can delete you. Their platforms can be used to coordinate social movements and insurrections. A content moderator thousands of miles away can change your life. What does this mean for democracy – and our shared reality?

Jamie Bartlett traces the story of how and why social media have become the new information gatekeepers, and what the decisions they make mean for all of us.

Start the Week - Made out of glass

The history of glass-making dates back to at least 3,600 years ago in Mesopotamia, and both manufactured and naturally-occurring glass have been used in a wide variety of objects across the world. The curator and director of the Stained Glass Museum in Ely, Jasmine Allen, looks back at its long and varied history, highlighting its practical and artistic qualities.

In the last century or so its industrial heartlands in Britain have been in the Black Country and the north east of England. John Parker, Professor of Glass Science at the University of Sheffield and curator of the Turner Museum of Glass, is an expert on the history of glass in this region, and the impact of mechanisation at the end of the 1800s.

A new exhibition, The Glass Heart, at Two Temple Place in London (until 21st April) showcases industrial glass making as well as contemporary artworks. The artist and glassblower Ayako Tani finds inspiration in traditional calligraphy for her glass art, as well as the more recent development of glass ships in bottles from the 1970s.

Glass can be moulded into all shapes and sizes and developed with different strengths, but the materials scientist Professor Claire Corkhill from the University of Bristol says it’s still quite a difficult and mysterious material. Her research is looking into innovative ways to use glass, and exploring whether it could even be the answer to the growing dilemma of managing Britain’s radioactive waste.

Producer: Katy Hickman