Nitrous oxide or laughing gas as been used as a recreational and medical drug since the late 1700s. Dentists often use it as an anaesthetic. It’s been linked to hippie, festival and rave culture for decades. And in the last few years, American rappers like Kanye West, Young Thug and Gunna have been open about using it.

You might have seen the little metal cannisters, that people use to dispense the drug, littering the streets. But now, manufacturers of nitrous oxide are producing bigger cannisters with different flavours and bright packaging and in the US, they are being stocked in smoke and vape shops.

Experts say this is contributing to a rise in the drug’s misuse. Using nitrous oxide can have harmful effects. Inhalation of nitrous oxide can lead to hypoxia, where the brain does not get enough oxygen. This can result in death. Regular inhalation can also lead to a Vitamin B12 deficiency which can cause nerve damage, degradation of the spinal column and even paralysis. The number of deaths attributed to nitrous oxide poisonings rose by more than 110% between 2019 and 2023, according to the American Center for Disease Control and Prevention.

In this episode BBC journalist Eve Webster explains how the use of nitrous oxide has changed recently, especially in the US. We hear about the risks of using it and where bans are in place. Ezra Marcus, an American investigative journalist, tells us how nitrous has become so popular in the US since the pandemic - and its links to American rappers. And BBC journalist Chigozie Ohaka sets out the current situation with nitrous oxide in Nigeria, where authorities tried to clamp down on it in 2023.

Instagram: @bbcwhatintheworld Email: whatintheworld@bbc.co.uk WhatsApp: +44 330 12 33 22 6 Presenter: Hannah Gelbart Producers: Julia Ross-Roy and Chelsea Coates Video Journalist: Baldeep Chahal Editor: Verity Wilde

Whether you’re struggling to write an email, planning a holiday, or wondering what to cook for dinner: increasingly more and more of us are turning to AI for the answer. But some experts have raised concerns that people are becoming too reliant on the new technology - and that this will have implications for how we learn and communicate with each other offline. So what’s the best way to use AI, and what alternatives are out there?

Our BBC Tech reporter, Liv McMahon, debunks some of the myths around AI chat bots and talks us through what you should consider when using them regularly. And Antonio Weiss, an AI & Digital Expert, shares his top tips for how to get the most out of your AI chatbot.

Instagram: @bbcwhatintheworld Email: whatintheworld@bbc.co.uk WhatsApp: +44 330 12 33 22 6 Presenter: Hannah Gelbart Producers: Benita Barden, Emily Horler and Chelsea Coates Editor: Verity Wilde

The K-pop industry is known for being super strict and encouraging idols not to share details about their private lives, especially their relationships. For LGBTQ idols, there’s an added layer of pressure, where they can’t reveal or talk about their sexuality at all, due to the stigma associated with homosexuality in South Korea. The country is deeply divided over LGBTQ acceptance.

So what happens if you do mention your sexuality as a K-pop idol? BBC Korean’s Juna Moon has been talking to Bain from the boyband JUST B, who came out as gay on stage during a show in Los Angeles earlier this year. We hear some of her interview with Bain, who talks about his fans’ reactions. And Juna explains why it’s so unusual for K-pop idols to disclose their sexual identity.

Instagram: @bbcwhatintheworld Email: whatintheworld@bbc.co.uk WhatsApp: +44 330 12 33 22 6 Presenter: Hannah Gelbart Producers: Julia-Ross Roy and Benita Barden Editor: Verity Wilde

Climate change is one of the biggest issues of our time. Warmer weather and melting ice is forcing people and animals to migrate but it’s also threatening traditions.

Myths, dances and national dishes - we’ve all got distinctive, defining customs that we would never want to lose. So what are people across the world doing to keep hold of their identities?

BBC journalist Abiona Boja explains how cultural heritage loss is affecting young people across the globe. We hear from Muntadhar Abdul Ali about the droughts in Iraq’s marshes. And Maya Natuk tells us how rising temperatures in Greenland are affecting people’s sense of identity there. They explain the actions they’re taking to save their cultural traditions from extinction.

Instagram: @bbcwhatintheworld Email: whatintheworld@bbc.co.uk WhatsApp: +44 330 12 33 22 6 Presenter: Hannah Gelbart Producers: Abiona Boja, Benita Barden and Julia Ross-Roy Video Journalist: Baldeep Chahal Editor: Verity Wilde

Ed Sheeran’s long-running copyright battle over his hit Thinking Out Loud is finally over. That’s after the US Supreme Court rejected an appeal to revive the copyright trial. It all started back in 2016 when Sheeran and his co-writer Amy Wadge were sued for allegedly copying Marvin Gaye’s 1973 classic Let’s Get It On. Sheeran, whose subsequent hits include Azizam and Shape of You, ended up winning that case, with the judge saying that lots of songs share similar elements and that Gaye’s chord progressions couldn’t be copyrighted. But the family of Ed Townsend, who co-wrote the song with Gaye, appealed the case, and it dragged on for nearly ten years.

BBC music correspondent Mark Savage breaks down the case and gives a quick rundown of how copyright law works in music. He also discusses other famous plagiarism allegations and the rules around sampling music to create new songs.

Instagram: @bbcwhatintheworld Email: whatintheworld@bbc.co.uk WhatsApp: +44 330 12 33 22 6 Presenter: Hannah Gelbart Producers: William Lee Adams, Emilia Jansson, Benita Barden Editor: Verity Wilde

There is a small but growing group of people in the US who are concerned that civilisation might collapse if people don’t have enough children. They’re called pro-natalists, and they argue that less children will lead to fewer workers and smaller economies, leading to an eventual collapse. Their solution: to save humanity people simply need to have kids. High-profile supporters of the movement include tech bros like Elon Musk and Donald Trump.

The BBC’s population correspondent Stephanie Hegarty tell us more about the movement and how it came about. We are also introduced to the Collins family, one of the leading pro-natalist families who want to have as many children as they can.

Instagram: @bbcwhatintheworld Email: whatintheworld@bbc.co.uk WhatsApp: +44 330 12 33 22 6 Presenter: William Lee Adams Producer: Mora Morrison Video Journalist: Baldeep Chahal Editor: Verity Wilde

Israel has launched a huge wave of attacks on Iran. They say the targets of their attacks are Iran’s nuclear facilities and important scientists. Iran has claimed it is not developing any weapons, yet several secret nuclear sites have been uncovered in the past. Iran has responded with drones and missiles. So is Iran developing nuclear weapons? Ghoncheh Habibiazad from the BBC Persian team talks us through Iran’s history with nuclear weapons. She also gives us an insight into what the reaction on-the-ground in Iran has been like since the attacks started.

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

Punjabi rapper Sidhu Moose Wala was at the peak of his fame when he was murdered in 2022. Goldy Brar, a gangster based in Canada, has said that he ordered the killing. But how did one of India’s most popular musical acts become the target of a feared gang?

Investigative journalist Ishleen Kaur has spoken to Brar about the murder and his motivations, which she explores in the BBC Eye documentary “The Killing Call.” Ishleen tells us about Moose Wala’s musical origins and his rise to fame. She also explains what his killers stood to gain by killing him.

Instagram: @bbcwhatintheworld Email: whatintheworld@bbc.co.uk WhatsApp: +44 330 12 33 22 6 Presenter: Hannah Gelbart Producers: William Lee Adams, Chelsea Coates Editor: Verity Wilde