A chunk of the planet Mars - the largest ever found on Earth - recently sold for $4.3 million at Sotheby’s auction house in New York City. A meteorite hunter first discovered the massive rock in the Sahara desert in Niger in 2023.

So how did the meteorite end up at an auction in New York City and why would anyone pay millions of dollars for it? BBC reporter Damian Zane walks us through the rock’s mysterious journey — from Mars to New York, via Niger and Italy. He also shares the concerns that Niger’s government has about the sale and how Sotheby’s has responded.

We also hear from Julia Cartwright from the School of Physics and Astronomy at the University of Leicester. She explains how the market surrounding meteorites can lead to even more discoveries.

Instagram: @bbcwhatintheworld Email: [email protected] WhatsApp: +44 330 12 33 22 6 Presenter: Hannah Gelbart Producers: William Lee Adams and Rosabel Crean Editor: Verity Wilde

It’s a question artists have been racking their brains over for years: how long is the perfect pop song? The rise of streaming platforms meant that for a while, the answer was to keep it short and snappy, so listeners would be less likely to hit the skip button. After the launch of TikTok, pop songs shrank even more, with the average song in the charts lasting only three minutes and twelve seconds. But BBC News analysis shows that song lengths are creeping back up, with some of the biggest hits in the last few years - like Chappell Roan’s Pink Pony Club - crossing over the four minute line. So, how has TikTok affected how artists make music? And are we about to see pop songs get even longer - despite the popularity of the platform?

BBC music correspondent Mark Savage explains why the length of pop songs has changed over the years - and what royalties have to do with it. And we hear from TikTok musicians Queen Ife and Fiona Kida, who tell us how the platform has changed how they create and share their music.

Instagram: @bbcwhatintheworld Email: [email protected] WhatsApp: +44 330 12 33 22 6 Presenter: Hannah Gelbart Producers: William Lee Adams and Chelsea Coates Video Journalist: Baldeep Chahal Editor: Julia Ross-Roy

Ghana has been described as the fashion industry’s dumping ground. Around 15 million second-hand garments arrive every week, making Ghana the world’s largest importer of used clothing. Many of the garments are re-sold and re-purposed at Kantamanto Market in the capital Accra. But estimates suggest that 40% of these garments are too damaged to be sold or upcycled, so much of it ends up as waste on Ghana’s beaches and lagoons.

Young people are working to solve the problem. One organisation trying to address the environmental impact of fast fashion is The Or Foundation. We attend a beach clean-up led by Joseph Shaw Ayesu, an ecological research manager, to find out how discarded garments end up on the beach. Then Sammy Oteng, a community engagement manager, explains why Ghana imports so much second-hand clothing in the first place. And finally Nutifafa “Fafa” Mensah gives us a tour of Kantamanto Market, where imported textiles are upcycled and re-purposed to extend their lifespan. Ruth, an upcycler, discusses the difficulties she faces working with bales filled with synthetic and severely worn textiles.

Instagram: @bbcwhatintheworld Email: [email protected] WhatsApp: +44 330 12 33 22 6 Presenter: Hannah Gelbart Producers: William Lee Adams and Benita Barden Editor: Julia Ross-Roy