Potatoes are having a moment. Once dismissed as dull, stodgy or even unhealthy, they are now back, appearing on restaurant menus, in food magazines and across social media feeds. But the story of the potato goes back much further. Ruth Alexander traces the journey of one of the world’s most familiar foods. From its origins millions of years ago to its place in today’s global food system. AJ Shehata, senior sous chef at Fallow restaurant in London explains why the potato forces chefs to get creative. At the Natural History Museum, botanist Sandy Knapp explains how the potato may have been born from a chance encounter between two wild plants in the Andes, an event that made it possible for potatoes to grow underground and spread across new environments. Potatoes USA president Blair Richardson explains how demand continues to grow worldwide, and how the industry is working to reshape the potato’s image. Nutrition scientist Candida Rebello shares research suggesting potatoes may be far more beneficial, and more misunderstood, than many people think. And, at the International Potato Centre in Peru, scientist Julian Soto works with farmers to conserve thousands of native potato varieties. In the Andes, potatoes are not just a crop, they are part of culture, identity and family life.

For more than 80 years, no-one knew what happened to a Soviet prisoner of war who escaped from the Nazis on the Channel Island of Jersey and spent the rest of World War Two hiding from the German occupiers with a local family, the Le Bretons. Known only by his first name, Bokejon, or simply Tom, he was one of about 2,000 Soviet prisoners and forced labourers brought to the island of Jersey to build Nazi fortifications. After liberation, Tom and the other surviving PoWs were sent back to the USSR and the Le Breton family, particularly their daughter Dulcie, always wondered what became of him. That was until BBC teams tracked down his descendants. BBC Russian's Olga Ivshina was one of the journalists who tracked him down.

Political violence has been a problem in Kenya for decades now. It is often carried out by gangs of young people, known as 'goons', who are sponsored by politicians to threaten, disrupt and attack rivals. After the general election in 2007 over 1500 people were killed and with another election planned for 2027, there are fears violence could erupt again. Wycliffe Muia of BBC Africa has been looking into these politically sponsored violent gangs and what can be done to stop them.

 Traditional fortune telling culture,  known as Saju, is popular in South Korea and has ancient roots. It uses data such as a person's birth year, month, day and hour to determine their future and in South Korea people still sometimes consult it before important life decisions like marriage, or seeking a new job. Now, the practice of Saju is beginning to be combined with AI technology and it's finding a wide audience both online and as a walk-in, more immersive experience. BBC Korean's Yujin Choi went to try it out.

The Fifth Floor is at the heart of global storytelling on the BBC World Service, bringing you the best stories from journalists in the BBC's 43 language services. We're here to help you make sense of the stories making headlines around the world; to excite your curiosity and to get to grips with the facts. Recent episodes have investigated Russia’s youth armies and how they make soldiers of Ukrainian children; featured the BBC team who were the first journalists to the site of the Nigerian school kidnappings and reflected the effects of internet blackouts in Iran, Uganda and India. If you want to know more about Venezuela’s acting president, Delcy Rodriguez, and the legacy of Hugo Chavez; or how Vladimir Putin’s network of deep cover spies operates; or why Donald Trump signed an executive order granting white South Africans asylum in the US, we have all those stories and more.

This episode of The Documentary comes to you from The Fifth Floor, the show at the heart of global storytelling, with BBC journalists from all around the world.

Presented by Faranak Amidi.

Produced by Laura Thomas, Caroline Ferguson and Hannah Dean.

(Photo: Faranak Amidi. Credit: Tricia Yourkevich)

Three women come together to discuss a sensitive subject that is not often talked about: Injuries experienced during childbirth. While many of these injuries heal quickly, millions of women around the world sustain trauma that can impact their long-term physical, psychological, and social well-being. “You really have to struggle not to feel ashamed that your body has failed you,” Gill tells us. “You’re led to believe as a woman that this is what we’re here to do, to get pregnant and to give birth to babies easily and without any problems afterwards.” We also hear about the stigma surrounding birth injuries in some parts of the world, including the Democratic Republic of Congo, and bring together health professionals helping women rebuild their lives and educate their communities. Warning: our guests discuss the physical impact of childbirth, which will include some detailed biological descriptions.

David Eubank calls himself a missionary soldier. A former US Special Forces soldier, he is now an ordained Christian Reverend and founder of the Free Burma Rangers, a humanitarian group working in some of the world’s most dangerous conflict zones. He prays before missions, runs towards gunfire, rescues the wounded, and says love is what keeps him there. But David's story is also morally complicated. He has carried dying children from battlefields. He has watched friends and colleagues die. And he has killed. Rajeev Gupta speaks to David about what it means to follow Jesus in a firefight. David reflects on his upbringing as a missionary child in Thailand, his years in the US military, and the call that took him into Burma’s long-running civil war. He describes the moments when his faith and a desire for revenge came into conflict. But how does David know he is on the right side? How does he justify taking his wife and children into war zones? And how does he keep believing in God after seeing so much suffering? This episode of The Documentary, comes to you from Heart and Soul, exploring personal approaches to spirituality from around the world.