In this episode we’re tracing the route of a shadow ship. These ships are part of a network carrying Russian oil around the world - in violation of international sanctions. And some of them have been accused of sabotage, severing undersea cables that connect European countries. The “shadow fleet” is growing in size and posing a risk to other ships and the environment.

BBC journalist Emilia Jansson explains what shadow ships are and what some Scandinavian countries are trying to do about them. And we hear from BBC journalist Tim Whewell who travelled to the Laconian Sea, where shadow ships frequently carry out ship-to-ship transfers of cargo.

Instagram: @bbcwhatintheworld Email: whatintheworld@bbc.co.uk WhatsApp: +44 330 12 33 22 6 Presenter: William Lee Adams Producers: Emilia Jansson and Julia Ross-Roy Editor: Verity Wilde

Myanmar is reeling following a powerful earthquake on Friday. The epicentre was near the second largest city Mandalay, home to about 1.5 million people. According to the government, more than 2,000 people have been killed. The country is already in the midst of a worsening humanitarian crisis and civil war. It’s also ruled by a military junta who control almost all the media. We hear from Soe Win Than, the editor of the BBC’s Burmese service, about why it’s difficult to get all the information.

Tremors were also felt in Thailand - where thousands were evacuated from cracked buildings and at least 20 people have died.

Myanmar is considered one of the world’s most geologically active areas and prone to serious natural disasters. We speak to Stephen Hicks, a seismologist and research at University College London, about why earthquakes are so hard to predict.

Instagram: @bbcwhatintheworld Email: whatintheworld@bbc.co.uk WhatsApp: +44 0330 12 33 22 6 Presenter: Hannah Gelbart Producers: Emily Horler and Benita Barden Editor: Verity Wilde

US Vice-President JD Vance and his wife Usha are scheduled to land in Greenland on Friday afternoon. Their visit comes as President Donald Trump continues his threats to take over the world’s largest island, which is a semi-autonomous territory of Denmark. But the planned visit has been scaled back following protests. Rather than visiting a dog sled race and cultural sites, the Vances will instead tour an American space facility. BBC journalist Laura Gozzi explains the basics of what the United States would gain if Greenland became part of the U.S. And we also hear reaction from two 26-year-old Greenlanders, as we try to understand how local people feel about the latest developments.

Instagram: @bbcwhatintheworld Email: whatintheworld@bbc.co.uk WhatsApp: +44 0330 12 33 22 6 Presenter: Hannah Gelbart Producers: Mora Morrison and Elena Angelides Editor: Verity Wilde

The global hair wig and extension market was valued at $7.5billion in 2024. Hair is big business - especially in India, which is the world’s biggest exporter of human hair, supplying 85% of global demand. Some comes from temples, where people shave off their hair as an act of devotion to the gods. It is then sold at auction. The rest comes from hair pickers who collect it from women’s combs, salons and even rubbish dumps.

Priti Gupta, a journalist in Mumbai, talks us through the Indian hair industry. We ask why Indian hair is so sought after - and why it’s China that’s leading the wig export market, instead of India. BBC journalist Nadia Gyane explains where this hair ends up - and if customers know or care where their hair comes from? And drag artist Zeeshan Ali in Mumbai tells us why wigs are so important to their act.

Instagram: @bbcwhatintheworld Email: whatintheworld@bbc.co.uk WhatsApp: +44 330 12 33 22 6 Presenter: Hannah Gelbart Producers: Mora Morrison, Elena Angelides and Julia Ross-Roy Video Journalists: Baldeep Chahal and Kesewaa Browne Editor: Verity Wilde

Thousands of people in Turkey turned out for a seventh night of protests which have so far seen more than 1,400 people detained, including students, journalists and lawyers. Demonstrations began in Istanbul on 19 March, when the city's Mayor Ekrem Imamoglu - who is seen as President Recep Tayyip Erdogan's main political rival - was arrested on corruption charges.

In this episode we bring you the background to the protests. Nihan Kalle, a reporter for BBC Monitoring in Istanbul, tells us why President Erdogan is still popular after 22 years in power and why Ekrem Imamoglu is seen as a threat to him. BBC Turkish reporter Özge Özdemir explains the state of democracy in Turkey right now. And we hear directly from some of the student protestors - what changes do they want to see in Turkey?

Instagram: @bbcwhatintheworld Email: whatintheworld@bbc.co.uk WhatsApp: +44 330 12 33 22 6 Presenter: Hannah Gelbart Producers: Mora Morrison, Julia Ross-Roy and Maria Clara Montoya Editor: Verity Wilde

Fluoride has been in most American tap water for decades. It’s there to help to prevent tooth decay, especially in children. Scientists and health officials say it’s one of the biggest public health wins of the 20th century.

But lately, fluoride has found itself at the centre of a heated debate, with some people concerned about side effects. Robert F Kennedy Jr, the US Health Secretary, is one of those, but he has long expressed views that conflict with scientific evidence.

We break down the facts about fluoride, explain how the quantities of it in water is safe and tell you what you need to know with Phoebe Hopson, a BBC reporter, and Michelle Roberts, a doctor and health reporter.

Instagram: @bbcwhatintheworld Email: whatintheworld@bbc.co.uk WhatsApp: +44 0330 12 33 22 6 Presenter: Hannah Gelbart Producers: Julia Ross-Roy and Emily Horler Editor: Verity Wilde

Over 500 schools and universities in South Korea are dealing with a deepfake porn crisis. Explicit images and videos of classmates and teachers are being shared. The perpetrators are often students themselves. In fact, 80 per cent of those arrested for creating and distributing deepfakes are teenagers.

Hyojung Kim from the BBC’s Korean Service explains what’s happening and what’s being done to stop it.

Plus, presenter and campaigner Jess Davies gives us tips on what to do if you have been deepfaked.

If you’ve been affected by any of the issues raised in this episode and you are based in the UK, you can get support from relevant organisations through the BBC Action Line website: https://www.bbc.co.uk/programmes/articles/22VVM5LPrf3pjYdKqctmMXn/information-and-support-sexual-abuse-and-violence.

Instagram: @bbcwhatintheworld Email: whatintheworld@bbc.co.uk WhatsApp: +44 0330 12 33 22 6 Presenter: William Lee Adams Producers: Julia Ross-Roy, Elena Angelides, Benita Barden and Adam Chowdhury Editor: Verity Wilde

The annual World Happiness Report is out and Finland has been named the happiest country for the eighth year in a row.

What makes the Finns so joyful? Emilia Jansson from the What in the World team breaks it down for you.

But, is happiness just a fleeting emotion or is there more to it? Sarah Jelbert, a lecturer who teaches courses on the science of happiness explains how you can improve your life satisfaction.

And we hear from Sweden and Costa Rica, two countries that rank in the top ten.

Instagram: @bbcwhatintheworld Email: whatintheworld@bbc.co.uk WhatsApp: +44 0330 12 33 22 6 Presenter: Hannah Gelbart Producers: Emily Horler and Maria Clara Montoya Editor: Julia Ross-Roy