Nauru is the third smallest country in the world. It’s located in the middle of the South Pacific Ocean and is home to around 12-thousand people. The tiny island has recently received its first transfer of foreign detainees from Australia - following a controversial deal between the two nations. The deal was struck after Australia's top court ruled that it could not indefinitely detain about 358 people, the bulk of whom have been convicted of crimes, forcing their release into the community. The BBC’s Katy Watson is based in Sydney. She breaks down what we need to know about this deal, and what it says about Australia’s migration policy.

Instagram: @bbcwhatintheworld Email: [email protected] WhatsApp: +44 330 12 33 22 6 Presenter: Iqra Farooq Producers: Chelsea Coates and Mora Morrison Editor: Verity Wilde

How does someone stop being a prince? The UK's King Charles has announced that his brother Andrew will no longer have this or any of his other titles after public pressure over his links with the convicted sex offender Jeffrey Epstein. He will also have to vacate his royal mansion in Windsor.

This is a rare move in royal history. In this episode we break down the main points and take a closer look at the people key to the story: the former prince; the King; Jeffrey Epstein and Virginia Giuffre, a victim of sex trafficking who alleged Andrew had sex with her three times as a teenager and whose memoir was recently published.

Instagram: @bbcwhatintheworld Email: [email protected] WhatsApp: +44 330 12 33 22 6 Presenter: Hannah Gelbart Producers: Benita Barden and Maria Clara Montoya Editors: Verity Wilde and Harriet Oliver

Sumo is Japan’s national sport. Its origins go back more than 1,500 years, and it rarely leaves Japan. But some competitions are starting to tour - including The Grand Sumo Tournament, which recently happened in London. Wrestlers often start training from a very young age, and training is intense. It involves building strength and fitness - and eating. A lot. They consume around 10,000 calories a day.

The BBC’s Mariko Oi is from Japan. She talks us through all we need to know about the sport. We also hear from 21-year-old Aonishiki Arata. He’s one of Ukraine’s top wrestlers and now lives and trains in Japan. And two fans share why they love the sport.

Instagram: @bbcwhatintheworld Email: [email protected] WhatsApp: +44 330 12 33 22 6 Presenter: Hannah Gelbart Producers: Mora Morrison and Natalia Makohon Editor: Verity Wilde