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BBC Radio 4

Tim Harford and the More or Less team try to make sense of the statistics which surround us. From BBC Radio 4

More or Less: Behind the Stats

In early February 2025, something strange started happening across US government websites. 

Decades of data began disappearing from webpages for agencies such as the Centres for Disease Control and Prevention, the National Institutes of Health and the Census Bureau. In many cases the entire website went dark. 
Within a few days some 8,000 government pages and 3,000 datasets had been taken down. Since then, many have been reinstated - but some have not. 
We speak to Professors Maggie Levinstein and John Kubale to find out why this data was taken away, and why any of it matters. 

If you spot any numbers or statistical claims that you think we should check out contact: moreorless@bbc.co.uk 

Presenter: Tim Harford
Producer: Lizzy McNeill
Series Producer: Tom Colls
Editor: Richard Vadon
Production Co-Ordinator: Rosie Strawbridge 
Audio Mix: Neil Churchill

The Case of the Missing US Data

Tim Harford investigates some of the numbers in the news. This week:

Lib Dem leader Sir Ed Davey says it was easier to deport illegal migrants to Europe when we were in the EU. Is that true?

Did the governor of the Bank of England get his numbers wrong on the UK’s ageing population?

Why is the price of beef up by 25% in a year?

Is it possible to prove that MPs are using AI to write their speeches?

If you’ve seen a number you think we should take a look at, email the team: moreorless@bbc.co.uk

Presenter: Tim Harford
Reporter: Lizzy McNeill
Producers: Nathan Gower and Nicholas Barrett
Series producer: Tom Colls
Production co-ordinator: Maria Ogundele
Sound mix: Gareth Jones
Editor: Richard Vadon

Was it easier to deport migrants to France before Brexit?

On September the 10th 2025, right-wing political activist and media personality Charlie Kirk was assassinated while speaking at an event in Utah. In the aftermath, his friend JD Vance, the US Vice President, hosted a special memorial edition of ‘The Charlie Kirk Show’, live from the White House, during which he called for unity, but said that could only be found by “climbing the mountain of truth”. 

“While our side of the aisle certainly has its crazies, it is a statistical fact that most of the lunatics in American politics today are proud members of the far left,” he said. We investigate the statistical evidence around political violence – both in people’s attitudes and the crimes themselves. 

Presenter: Tim Harford 
Reporter: Lizzy McNeill 
Series producer: Tom Colls 
Sound mix: Hal Haines 
Editor: Richard Vadon

Is JD Vance right about left-wing violence?

Tim Harford investigates some of the numbers in the news. This week:

Nigel Farage says 6.5 million people are on out-of-work benefits – with some benefits up 80% since 2018. Are those numbers right?

Do French pensioners really earn more than their working-age compatriots?

How is it possible for one kilogram of fish food to produce one kilogram of salmon?

And do we really have five senses?

If you’ve seen a number you think we should take a look at, email the team: moreorless@bbc.co.uk

Presenter: Tim Harford
Reporter: Lizzy McNeill
Producer: Nicholas Barrett
Series producer: Tom Colls
Production co-ordinator: Maria Ogundele
Sound mix: Neil Churchill
Editor: Richard Vadon

Is it true that out-of-work benefits have almost doubled?

Nvidia CEO Jensen Huang says the world faces a severe labour shortage – 50 million workers by the end of the decade.
The boss of the world’s most valuable company thinks humanoid robots will be needed to fill the gap.

But is this prediction based on solid evidence?

Tim Harford looks at the calculations behind the claim with Rajiv Gupta, a technology expert at Boston Consulting Group, who is the likely source of the 50 million figure.

If you’ve seen a number in the news you think we should look at, email the team: moreorless@bbc.co.uk

Presenter: Tim Harford
Producer: Nicholas Barrett
Series producer: Tom Colls
Sound mix: Hal Haines
Editor: Richard Vadon

Will the world really be 50 million workers short by 2030?

Tim Harford looks at some of the numbers in the news. This week:

Is it true that interest payments on the UK’s national debt are equivalent to £240 per month for everyone in the country?

Reform UK claim that Afghan migrants are 22 times more likely to be convicted of sex offences. Is that number correct?

We try to make sense of a claim that one in 10 women are being driven to leave work by their menopause symptoms.

And we investigate a claim comparing the speed of a snail and the war in Ukraine.

If you’ve seen a number you think we should look at, email the team: moreorless@bbc.co.uk

Presenter: Tim Harford
Reporter: Lizzy McNeill
Producer: Nicholas Barrett
Series producer: Tom Colls
Production co-ordinator: Maria Ogundele
Sound mix: James Beard
Editor: Richard Vadon

Are Afghan nationals more likely to be convicted of sexual offences?

Hollywood has given sharks a terrible reputation. But in reality, the finned fish should be far more scared of us, than we of them.

Millions of sharks are killed in fishing nets and lines every year.

One statistical claim seems to sum up the scale of this slaughter – that 100 million sharks are killed every year, or roughly 11,000 per hour.

But how was this figure calculated, and what exactly does it mean?

We go straight to the source and speak to the researcher who worked it out, Dr Boris Worm, a professor in marine conservation at Dalhousie University in Canada.

Presenter: Lizzy McNeill
Producer: Nicholas Barrett
Series producer: Tom Colls
Production coordinator: Brenda Brown
Sound mix: Annie Gardiner
Editor: Richard Vadon

Do 11,000 sharks die every hour?

Fully autonomous cars are here. In a handful of cities across the US and China, robotaxis are transporting human passengers around town, but with no human behind the wheel.

Loyal Listener Amberish wrote in to More or Less to ask about a couple of safety statistics he’d seen regarding these self-driving cars on social media. These claimed that Waymo self-driving taxis were five times safer than human drivers in the US, and that Tesla’s self-driving cars are 10 times safer. 

But, are these claims true? 

We speak to Mark MacCarthy, a Senior Fellow at the Brookings Institution Center for Technology Innovation, to find out.

If you’ve seen some numbers you think we should look at, email the team: moreorless@bbc.co.uk

Presenter: Lizzy McNeill
Producer: Nicholas Barrett
Series producer: Tom Colls
Production co-ordinator: Brenda Brown
Sound mix: Neil Churchill
Editor: Richard Vadon

Are self-driving cars safer than cars with drivers?

Are office temperatures set too low in the summer for women to be comfortable? 

This idea has featured in news headlines and comedy videos which describe the summer as a “women’s winter”.

But is there evidence behind the claims of a gender bias in air conditioning? 

To find out, we speak to Gail Brager, Director of the Center for Environmental Design Research at UC Berkeley, and Boris Kingma, a senior researcher at TNO, the Netherlands Applied Research Institute.

Presenter: Lizzy McNeill
Producer: Nicholas Barrett
Series producer: Tom Colls
Production co-ordinator: Rosie Strawbridge
Sound mix: James Beard
Editor: Richard Vadon

Do women feel the cold more than men?

In early July, the Mediterranean Sea experienced a marine heatwave. The surface of the water reached temperatures of 30 degrees in some places. 
A social media post at the time claimed that some of these sea temperatures were so different to the normal sea temperature at this time of year, that the sea was experiencing a “1-in-216,000,000,000-year sea temperature anomaly”. 
This would suggest that the likelihood of the event was on a timescale far longer than the amount of time the entire universe has existed. 
Is the claim true? Dr Jules Kajtar, a physical oceanographer from the National Oceanography Centre, takes a look at the statistics. 
We heard about this story because a listener spotted it and emailed the team. Get in touch if you’ve seen a number you think we should look at. moreorless@bbc.co.uk

Presenter: Lizzy McNeill
Series producer: Tom Colls
Production co-ordinator: Rosie Strawbridge 
Sound mix: Neil Churchill
Editor: Richard Vadon

How weird was the Med Sea heatwave?

Tim Harford tells the story of how two economists who disagree with each other have been jointly awarded the Nobel Prize. Eugene Fama has shown that stock markets are efficient, while Robert Shiller has shown that they're not. Tim interviews both professors about their findings, and this apparent contradiction.

WS MoreOrLess: Nobel Prize puzzle

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