Seriously...

We hear from one of the world’s last remaining globemakers and reflect on the globe’s cultural and symbolic currency.While Google Earth may give us intricate detail of every inch of land, there’s nothing like clutching a globe to properly comprehend our place in the world. We’ve been fascinated by replicating our planet since ancient times; an art and science that’s developed as our understanding has evolved.In this programme, we step into the studio of Bellerby & Co Globemakers, one of the few companies remaining that are making globes by hand today. From their Stoke Newington warehouse, we follow the journey of a globe from design to dispatch. We hear about the challenges they face daily, from retraining their hands to querying geopolitical protocol, and the customers who’ve commissioned their unique bespoke worlds.Alongside this creative process, we visit installation artist Luke Jerram, who is touring his replica earth artwork, Gaia. We also hear from writer and cartography enthusiast Simon Garfield and globe conservator Sylvia Sumira to explore the rich history of globemaking as well as some bigger ideas around the influence of those who represent our planet to us. The globe is crucially illustrative of our shared experience. Do we need its symbol today more than ever?Produced in Cardiff by Amelia ParkerPhoto by kind permission of Bellerby & Co Globemakers (credit: Sebastian Boettcher) Gaia soundtrack courtesy of Luke Jerram and Dan Jones

Why do you keep going back to the fridge after dinner? Fruit and vegetables, a balanced diet, low salt, low sugar and moderate exercise seem to be the silver bullets loaded into a revolver that has only ever fired blanks at the problem of Britain’s obesity crisis. More than ten years ago, the celebrity chef Jamie Oliver came to Rotherham in an effort to help combat obesity, by providing information on how to cook healthy foods. A decade on Rotherham still has a high proportion of people that are overweight or obese.In What’s Eating Rotherham, local resident Joanne Keeling, who is 28 stone and trying to lose weight, looks at the emotional side of overeating and examines the effect Jamie Oliver - and the spotlight he brought to Rotherham - can have on a town at the centre of media attention. With the help of Producer Jay Unger, Joanne soon discovers an uncomfortable truth about why some people emotionally eat. As well as questioning whether or not traditional methods of treating obesity, like prescribed exercise and diet regimes, actually work she wants to learn about the psychology of why people overeat in the first place.

In an age of certainty, of assertions without facts, and sometimes assertions with facts, Mark O’Connell makes the case for a different virtue – ambivalence. Six years on from his thought-provoking, witty and charming Four Thought, he returns to make the case for ambivalence.In those six years almost every trend in public life has been away from ambivalence rather than towards it. Populist movements from the left and the right are about certainty, and even the idea of balance often ends up sharing single, entrenched views, just neatly arrayed on either side.Yet in real life few decisions are truly clear-cut, there is often a case on both sides, and a reasonable person could easily reach a different conclusion with the same evidence. Most of us, much of the time, have complex and mutually contradictory views on issues small and large. And that's also true in public life: the arts and business, politics and the military are all properly in the realm of ambivalence, with complicated, messy and marginal decisions.Mark begins this programme in Dublin, speaking to a philosopher, a psychologist, an essayist and an art critic about what ambivalence is, how central it is to the human experience, and how we might embrace it. Then he travels to London, to examine areas of public life, and issues, where ambivalence feels less comfortable, more challenging. But as someone who is profoundly ambivalent about most things, much of the time, can he sustain the courage of his own ambivalence?Producer: Giles Edwards

David Baker, contributing editor of Wired, explores the challenges Facebook must meet and overcome in order to survive after a disastrous period which has seen the reputation and the business model of the social media giant questioned like never before.Producer: Jonathan Brunert

Lucy Cooke sets out to discover why honesty is almost certainly not the best policy, be you chicken, chimp or human being. It turns out that underhand behaviour is rife throughout the animal kingdom, and can be a winning evolutionary strategy. From sneaky squid, to cheating cuckoos, some species will resort to truly incredible levels of deception and deviousness to win that mate, or get more food. And when it comes to social animals like we humans, it turns out that lying, or at least those little white lies, may be the social glue that binds us all together.Lucy heads to the RSPB cliffs at Bempton, with Professor Tim Birkhead to discover why so many bird species appear to be such proficient deceivers, as well as visiting the very crafty ravens at The Tower of London. She speaks to psychologist Richard Wiseman about how to spot when someone is lying, and finds out whether she is any good at it. In fact, can we trust any of what she says in this documentary at all?Presenter Lucy Cooke Producer Alexandra Feachem

Hannah Jane Walker argues that sensitivity is overlooked, dismissed and under-utilised, and argues that our society would be much better off if we embraced it instead.Two years ago, Hannah gave a Four Thought talk about sensitivity, and received hundreds of emails from strangers, reaching out to tell her the same things: that sensitivity in our society isn’t considered useful, and that, well, ‘that’s just the system that we live in, isn’t it?’ Since then, Hannah has felt slightly ashamed at having started such a powerful conversation without offering a solution. And so in this programme she sets out to do just that. She’ll be talking to several of her correspondents, as well as a psychologist, a neuroscientist, an economist and even a newly-minted activist for the highly sensitive.The programme focuses on highly sensitive people, but sensitivity is a spectrum and as Hannah hears more about it, she also finds out more about the benefits all of us can take from being in closer touch with our sensitive sides.Producer: Giles Edwards

Anxiety has become one of the defining characteristics of our modern age, with millions of us suffering from its various damaging effects. It comes in many shapes and sizes - status anxiety, social anxiety, and more recently Brexit and Eco-anxiety. Figures indicate a big rise in its prevalence, particularly among young people and members of minority groups. In this editon of 'Archive on Four' Professor Andrew Hussey how this new age of anxiety has come about, how it compares with previous moments of national stress, and also why he believes it to be a peculiarly modern phenomenon. Hussey makes the case that while pathological forms of anxiety can be crippling, anxiety can also bring with it positive benefits - and rather than attempt to destroy it we should attempt to make it a useful ally.Producer - Geoff Bird

What happens when top graduates work behind bars as prison officers? Lucy Ash meets young people who have forsaken lucrative careers in the City or elsewhere, for what many see as one of the world’s worst jobs. They’re part of Graduates Unlocked, a scheme which, which is trying to replicate in the prison service the success of Teach First, the programme that sends high-flyers into inner-city schools.The aim is to raise the status and reputation of prison officers, to boost recruitment and cut reoffending. It is hoped that youthful enthusiasm plus resilience and empathy could bring a much needed revolution to the criminal justice system.But faced with acute understaffing and assaults on prison officers at record levels, how much of a difference can the graduates make? Lucy meets a group of young men and women who are are sent to HMP Aylesbury, which holds the longest-sentenced young adult males in the English prison system. The youth offender institution in Buckinghamshire is "in a perpetual state of crisis" according to the Howard League for Penal Reform. A few months into the graduates' stint there, the youth prison is placed in special measures for keeping some inmates locked up for 23 hours a day. Can the graduates' early idealism survive the reality of life behind bars?Producer: Arlene Gregorius

A tense debate is taking place in states across America. At what age should someone be allowed to marry? Currently in 48 out of 50 states a child can marry, usually with parental consent or a judge's discretion. In 17 states there's no minimum age meaning in theory a two year old could marry. But there's a campaign to change the law and raise the minimum age of marriage to 18 without exceptions across all American states. But changing the laws state by state is not as easy as one may think. There's resistance and raising the minimum age to 18 has often been blocked by legislators.Jane O'Brien speaks to child brides, the campaigners pushing to make it illegal and the people who say that the laws don't need to change.Producer: Rajeev Gupta Editor: Amanda Hancox

Hate seems to be everywhere - whether it’s white supremacists marching on the streets of America, jihadists slaughtering Christians in Sri Lanka or the massacre of Muslims in New Zealand. In this five part series, BBC journalist Allan Little unpicks the mechanics of hatred and reveals how this dangerous emotion has been whipped up and disseminated throughout history. Allan Little begins with the hatred he witnessed on the killing fields of the Bosnian War, deconstructing how Serbian leaders like Slobodan Milosevic and Radovan Karadzic manipulated and weaponised history to inculcate a violent loathing that would lead to the massacre of thousands of Bosnian Muslims at Srebrenica. It's a hatred and an ideology that continues to inspire today's extreme far-right.Presenter: Allan Little Producer: Xavier Zapata Editor: Helen Grady