As the Russian Invasion of Ukraine continues, the effects ripple around the rest of the world. One concern involves the wheat harvest. There have been claims that Ukraine and Russia supply 25% of the worlds wheat and that as a result we’re facing a global wheat crisis. We look into this misleading figure to determine what the real impact might be.

The War in Ukraine has reminded the world how easily conflict might escalate into a Nuclear War. But according to Professor Barry Nalebuff of Yale University, good strategy and negotiating can help us with everything from avoiding Armageddon to dividing up a pizza fairly. Tim Harford talks to Barry Nalebuff about his new book, “Split the Pie”.Presenter:Tim Harford Producer: Lizzy McNeill

As the war in Ukraine continues, Reuters has reported that some 2.3 million people have been displaced. So far many of those have sought refuge in neighbouring countries. The UN estimates that as of the 8th of march Poland has taken in almost 1.3 million refugees, Hungary just over 200,000 and Slovakia almost 100,000. In comparison the UK has issued visa’s to just under 1000 people. Some say this isn’t enough, however, Prime Minister Boris Johnson defended the governments record claiming that ‘"We've done more to resettle vulnerable people than any other European country since 2015." Sound familiar? Join us on a journey back to 2020 to find out whether this is accurate or just a repeated misleading claim.

Following Russia’s invasion of Ukraine, we take a look at some of the numbers coming out of the conflict and ask how to know which information you can trust during a war. We also investigate the perplexing claim that the seas around the Chagos Islands are 100m lower than the seas around the rest of the world.

How reliable are the figures coming out of the conflict in Ukraine?Following Russia’s invasion of Ukraine, we consider claims about the numbers of troops involved, people killed, and planes downed.Also: are the prime minister’s parliamentary claims about growing numbers of NHS staff backed up by data? We investigate the perplexing claim that the Chagos Islands are 100 metres below sea level. How long do you have to drive an electric car to offset the pollution from making the battery? And do we really make 35,000 decisions a day?

Lockdown. A word we’ve all become overly familiar with over the past two years. Lockdowns were intended to protect people, especially societies most vulnerable, from the risks associated with contracting Covid. However, a new study has been making headlines which claims to show that mandatory lockdowns have only reduced Covid-19 mortality by 0.2%, or one death in five hundred. We examine the evidence behind the claim.

Jabs for five to 11-year-olds, lockdown effectiveness, and being green on two wheels.Governments across the UK have decided to offer Covid vaccinations to primary school-aged children. What was the data behind this decision?What effect did lockdowns have on preventing deaths from Covid? We look at a research paper that says almost none. Plus, is Elon Musk right to warn of a global population collapse? And can it really be greener to ride an e-bike than a good old-fashioned push bike?

Covid vaccines will be offered to all children across the UK between the ages of 5 and 12 - some months after the same decision in countries such as Italy and Germany. It is a topic that has caused a fair amount of controversy and with controversy often comes suspicious statistical claims. We look at the data behind child hospitalisations and deaths due to Covid19.

How likely are children to end up in hospital because of Covid? And how many have died?We scrutinise some scary stats that have been circulating on social and examine what excess deaths figures tell us about the risks of Covid compared to other illnesses.Plus, with the gift of hindsight, we examine the joys and sorrows of modelling the spread of the virus. Do MPs understand how false positive rates work? And we unwrap the mystery of the nanomoles.

In early December 2021 a member of Penn University Women’s Swim Team caused a stir. Lia Thomas not only won three events but she had the fastest time in elite college swimming in the country in two out of three races. This achievement reignited a debate as Lia Thomas is a transgender woman; we examine the rules around testosterone and trans women’s participation in elite sport.

Boris Johnson has been ticked off for misleading Parliament on jobs and on crime. He claimed that the number of people in employment has been rising - when it’s been falling. And he made a claim that crime has fallen - when it’s risen. We discuss the truth, and what Parliament can do to defend it.Plus, we examine the rules around testosterone and trans women’s participation in elite sport, and the spirit of Donald Rumsfeld is with us as we try to navigate the largely unknown world of fungi.

Have you given up on your New Year’s resolution yet? Every year many of us make the promise to become better, shinier, more accomplished versions of ourselves by the same time next year. It’s often easier said than done but to an extent it really is the thought that counts. David Robson, author of ‘The Expectation Effect’ says the power of our expectations can cause real physiological effects but Mike Hall, co-director of ‘The Skeptic’ magazine isn’t convinced.

Conservative politicians have taken to the airwaves to tell us to forget the parties, and just look at the economic growth - but is the UK really growing faster than other leading economies?The Omicron variant has raised the chance that people are re-infected with Covid - how common is that, and should it change the way we read the statistics that are reported each day?The great statistician Sir David Cox has died; we remember his life and his contribution to the science of counting.And does comparing the number of food banks to the number of McDonald’s restaurants in the UK tell us anything about food poverty?

Under lockdown, couples were destined to find themselves closer than ever before, but despite what you’d think – this didn’t result in a higher birth rate. In fact in developed countries across the world the birth rate is falling, we spoke to Professor Marina Adshade about why this is and what this could mean for the future.

Food writer Jack Monroe sparked national debate this week when she tweeted about food price hikes on the cheapest goods in supermarkets - but does inflation really hit low income households hardest?Social media and some news outlets have spread claims this week that only around 17,000 people have actually died of Covid. We debunk.We test the truth of the five second rule - is it a good idea to eat watermelon within five seconds of dropping it on the floor? And can you think yourself better?

In early January several newspapers ran article claiming that ‘women are 32% more likely to die after operation by male surgeon. If true, this is a terrifying figure but is all as it seems? We dig into the data to find out whether women should really be worried about having a male surgeon.

Are women 32% more likely to die after operation by a male surgeon? Headlines asserting this were shared across social media recently - but the truth is a bit more complicated.We compare the price and the quality of the UK’s Test and Trace system with that of Germany and check on what’s happening to the Covid death toll during the Omicron wave.And we investigate the worrying statistic that one in ten people are planning to start a podcast in the coming year.

In December, Republican politician Lauren Boebert tweeted the claim that ‘365,348 children went missing in 2020’. This is a shocking statistic but is it true and does it mean what we think it means? We speak to Gabriel Gatehouse, international editor of Newsnight, who has been investigating conspiracy theories including the Qanon conspiracy theory for a new podcast, The Coming Storm.

The pandemic seems to be entering a new phase as Omicron has taken hold. Is it milder? And how might we make decisions based on the latest data?Predictions that lockdowns might lead to a baby boom have proven wrong - in fact fertility is falling.We re-examine a baffling claim about the number of children being abducted every year in the US after claims by a Republican politician on social media, and we run our statistical measuring tape up the inside leg of the government’s promise to give everyone a booster jab before New Year’s Day.

In October of last year popular Youtubers Mark Rober and the enigmatically named Mr Beast pledged to remove 30 million pounds of plastic from the Ocean – if they could raise $30 million dollars. A dollar per pound of plastic sounds like a fairly good deal, but how much plastic is out there and will they actually be removing anything from the Ocean at all?(Image: Sahika Encumen dives amid plastic waste in Ortakoy coastline: photo by Sebnem Coskun/Anadolu Agency via Getty Images)

In recent years population growth has slowed rapidly. Experts believe that the global population will stabilise somewhere around 11 billion people. But just because global population is stabilising doesn’t mean each country is following the global trend. Some projections estimate that the population of Nigeria will increase rapidly to the point that there will be more people living in Nigeria than the whole of Europe combined. We look at the methods behind this claim.

A guide to the most concerning, striking and downright extraordinary numbers of 2021. Tim Harford asks three More or Less interviewees about their most significant and memorable figure over the past year. From the excess death toll of Covid-19; to declining total fertility rates, and a spike in the concentration of carbon dioxide in the atmosphere, we showcase the numbers that tell us something about the year gone by. During this programme, we speak to Hannah Ritchie, head of research at Our World in Data and senior researcher at the University of Oxford; Marina Adshade, Economics Professor at the University of British Columbia; and Heleen De Coninck, professor at Eindhoven University of Technology, and a lead author on several reports by the Intergovernmental Panel on Climate Change.

Christmas, the most wonderful time of the year – if you have something to sell that is. Every year we waste hundreds of dollars on gifts that aren’t appreciated, but how can you ensure that the gifts you buy hit the mark every time? We speak to behavioural scientist Professor Francesca Gino to find out more then use our newfound knowledge to exam an old Christmas classic

Immunity to Covid-19. We've all been hoping to develop it ever since the virus emerged two years ago. Since then, a race to vaccinate the world has begun in earnest, with many countries rolling out booster shots in response to the rise of the Omicron variant. Health officials and scientists agree that vaccines are the safest way to develop immunity to the disease. But when US Congresswoman Nancy Mace took to Fox News recently, citing a study showing a whooping 27 times better immunity from natural infection than vaccination, we thought we'd better investigate. How did this study arrive at this number, and is it a fair representation of its findings?

Masks, you may not have worn them before 2020 but now we’re all at it. With the rise of the Omicron variant countries have scrambled to reintroduce public health policies, among them mask wearing. Health officials and scientists agree that masks help reduce the incidence of covid19 infections – but by how much is still debated. Several newspapers recently reported that masks could cut Covid-19 infections by 53%, we look at how they came to this number and whether we should be believe it. (Image: Leon Neal/Getty Images)

Vaccines are the best way to stop deaths and serious cases related to covid19, this is an irrefutable fact. However, recent ONS data seems to show that vaccinated people had a higher all cause death rate than unvaccinated people. Why is this data misleading? Here’s a clue: it’s to do with a quirky statistical phenomenon called Simpsons Paradox. (Image: The Simpsons / TCFFC )

Nowadays if you are an academic and who needs some participants for a study you go online, but over the summer academic studies were inundated with participants who all happened to be teenage girls ... we explore how one TikTok can tip the balance of data gathering. Presenter: Tim Harford Producer: Chris Flynn(Image: TikTok logo is displayed on a smartphone screen/Getty/NurPhoto/contributor)

A French minister told people to eat fewer croissants at this year’s COP26 summit, after the menu said the carbon cost of the pastry was higher than that of a bacon roll, even if it was made without butter. Tim Harford investigates whether this claim could be true, and how the effect of food on climate change can be measured.(Image: Continental breakfast with coffee and croissants: Getty/Cris Cantón)

When Professor Martin Schweinsberg found that he was consistently reaching different conclusions to his peers, even with the same data, he wondered if he was incompetent. So he set up an experiment. What he found out emphasises the importance of the analyst, but calls into question the level of trust we can put into research.Features an excerpt from TED Talks(Image: Getty/erhui1979)

Who is counting, why are they counting, and what are they are counting? These three questions are important to ask when trying to understand numbers, according to Deborah Stone, author of Counting, How We Use Numbers to Decide What Matters. In this episode, she explains how different ways of totting up can have real-world consequences.(Image: Betta Blue Red Veiltail/Getty Images/zygotehasnobrain)

Netflix has announced that South Korean survival drama Squid Game is its most popular series ever. We scrutinise the statistics behind the claim, and look at the odds of surviving one of the show’s deadly contests.

Do immigrants drive down wages, do minimum wage increases reduce job opportunities, and do people who did well in school earn more money? These are questions that the winners of the 2021 Nobel Memorial Prize in Economics looked to the world around them for answers to. David Card, Joshua Angrist, and Guido Imbens developed ways of interpreting what they saw that changed the way economists think about what they see. In this episode of More or Less, presenter-turned-guest Tim Harford explains how.(Image: Mariel boat lift, which brought over 100,000 Cubans into the United States: Photo by Tim Chapman/Miami Herald)

A chat with More or Less's founding producer and presenter plus the first episode in full. Tim talks to Michael Blastland and Sir Andrew Dilnot about how More or Less came into being (after several rejections), whether politicians and journalists are more numerate now, and where the name come from. Then, the very first episode of More or Less, originally broadcast on Radio 4 on 13 November 2001.

A look back at our origins, plus the usual mix of numerical nous and statistical savvy.It’s two decades since More or Less first beamed arithmetic into the unsuspecting ears of Radio 4 listeners. We revisit the show’s genesis with the original presenter and producer.Why are there two different figures about our vaccination rate doing the rounds and how does the UK now compare internationally?Plus listener questions on how the colour of your front door affects your house price, TVs on standby mode, and more. And we try to respond to a meteor storm of complaints about our earlier item asserting that Star Trek’s Mr Spock is in fact highly illogical.

Tim Harford talks to Planet Money’s Stacey Vanek Smith about the gender pay gap in the US and the UK – and how Renaissance writer, Machiavelli might be an unlikely source of inspiration for women in the workplace.

Is our electricity extra expensive and our insulation inadequate? And a tale of tumbling trees.Internet infographics suggest we’re paying way more for our energy than countries in the EU. Are they being interpreted correctly? And what part, if any, has Brexit had to play?Insulation Britain activists have been gluing themselves to motorway slip-roads to raise awareness about poor home insulation. Their website says we have the least energy efficient homes in Europe. What’s the evidence?Plus, what do the numbers tell us about migrants trying to cross the Channel in small boats? Are stereotypes about different generations backed up by the data? And is it or is it not true that the UK has lots of trees?

A coronavirus check-in, our daily mask use measured, and a minister's claim on the universal credit cut questioned.There was a time when the latest Covid statistics were headline news daily, but as the pandemic has stretched on into its second year and third wave people don't pay as much attention. But on More or Less we still keep an eye on them because that’s how we roll.A recent article estimated that 129 billion single-use face masks are used every day around the world. It sounds wrong, but how wrong is it? And how did it get so wrong?Making up the shortfall from the £20 weekly cut in the universal credit benefit means working an extra two hours a week - or an extra nine, depending on who you listen to. We run the numbers.Plus, has the number of periods women have in a lifetime increased fourfold? And how many holes does a drinking straw have?

Tim Harford talks to Jordan Ellenberg, professor of mathematics at the University of Wisconsin at Madison, about the pandemic, geometry and drinking straws.(multi-coloured straws/Getty images)

New data appears to show that double vaxxed people between 40 and 79 are getting Covid at higher rates than people who are unvaccinated, but that's not the case. It's all down to how Public Health England estimates the size of different populations. The Office for National Statistics described 2020 as "the deadliest year in a century". Now that we're more than two-thirds into 2021, we examine how this year is shaping up. We answer your questions on the new health and social care levy, and have words of congratulations and caution following Emma Raducanu's astonishing win in the US Open. Plus, where do you stand on in the dishwasher vs kitchen sink debate? GUESTS: Mathematician James Ward Adele Groyer of the Covid-19 Actuaries Response Group Helen Miller of the Institute for Fiscal Studies.

Should we be worried that the protection against Covid-19 provided by the vaccines is going down? Could it really be the case that eating a hot dog takes 36 minutes from your life? The Bank of England holds 35% of Government debt. Who owns the other 65%? Has the UK spent more on Test and Trace than on its operations in Afghanistan?

American President Joe Biden has said the war in Afghanistan cost more than $2 trillion. Todd Harrison, a senior fellow at the Centre for Strategic International Studies helps us unpick what’s included in this figure.

English Covid restrictions were lifted in July. Back then, some predicted that there could be as many as 6,000 hospital admissions a day by the following month. So, what happened?The Metropolitan Police says it’s spent £50 million on policing Extinction Rebellion since 2019. They’re on the streets again – can it really be that costly?The economics correspondent at The Economist Duncan Weldon puts government borrowing during the pandemic into context and talk about his new book, 200 Years of Muddling Through.Are we running out of lorry drivers? And to what extent is Brexit to blame? We look at the numbers behind a claim that there is a shortfall of 100,000 lorry drivers in the UK.Plus, disturbing evidence that Star Trek’s Mr Spock may actually be terrible at logic.

Writer Julia Galef talks to Tim Harford about the role of numbers in helping us think more rationally, and what Star Trek’s Mr Spock can teach us about making predictions. Julia is author of The Scout Mindset, a book about how our attempts to be rational are often clouded or derailed by our human impulses, and the ways we can avoid these traps. Producer: Nathan Gower(Image: Leonard Nimoy as Mr Spock. Credit: Bettmann/Contributor via Getty Images)

Dr Robert Moses, a pioneer in African-American civil rights and mathematics education has died at the age of 86. Charmaine Cozier looks at an extraordinary life, from the courthouses of 1960s Mississippi to the classrooms of modern public schools, and traces the philosophy and values that threaded their way through his life. Presenter: Charmaine Cozier Producer: Nathan GowerPortrait of American Civil Rights activist Robert Parris Moses, New York, 1964. (Photo by Robert Elfstrom/Villon Films/Gety Images)

A year later than planned, The Tokyo Olympics, have now finished. Thousands of athletes have competed in events that few thought might go ahead and there’s been record success. This week we take a look at Olympic numbers – how many records were broken in Tokyo, what factors might have influenced the races and what else can the data tell us?Tim Harford speaks to Dr Joel Mason, who runs the blog, Trackademic. Producer: Olivia Noon

As some countries rapidly roll out vaccination programmes, there have been concerns that increases in infection rates amongst vaccinated groups mean vaccines are less effective than we hoped, especially in the face of the feared Delta variant. Epidemiologist Dr Katelyn Jetelina from the University of Texas Health Science Centre School of Public Health explains why this isn’t what the numbers show – rather than decreasing vaccine effectiveness, increasing rates can be explained by a statistical phenomenon known as ‘base rate fallacy’. Presenter: Charlotte McDonaldProducer: Nathan Gower

June saw a brutal heatwave shatter a number of all-time temperature records in Canada and the Northwest of the USA. But when can we attribute new records to man-made climate change, rather than natural variation? Peter Stott, an expert in climate attribution at the UK’s Met Office, explains how climate change has dramatically increased the probability of seeing such extremes.Presenter: Tim HarfordProducer: Nathan Gower

The Delta Variant was first identified in India, fuelling a huge wave of cases and deaths. It is now spreading around the world, becoming the most dominant variant in many countries. This week we take a look at the numbers - where’s it spreading, how is this different to previous waves and what can be done to stop it?Tim Harford speaks to Professor Azra Ghani, Chair in Infectious Disease Epidemiology at Imperial College, London and John Burn-Murdoch, the chief data reporter at The Financial Times.

On the day the Government plans to drop the remaining Covid restirictions, Tim Harford and the More or Less team try to work out how long cases will continue to rise and whether we can be sure the link with deaths and hospitalisations has been broken. Is this “freedom day" or an unnecessary gamble with people’s lives?