Polar bears are the biggest bears in the world and the only marine bear. There are estimated to be around 26,000 globally. They’re mostly found in Canada, but also in Russia, the US, Norway and Greenland. Their main prey is seal, specifically seal blubber, as they need a diet high in fat to survive the freezing Arctic conditions.

Polar bears are great swimmers but they can’t outswim seals. So they hunt them on the Arctic sea ice, waiting for them to come up for air and then pouncing. But as the amount of sea ice decreases due to global warming, the polar bear populations that live in the more southerly, warmer parts of the Arctic are in decline.

BBC Science correspondent Victoria Gill explains what it’s like to see a polar bear up close and the challenges they’re facing. Alysa McCall, a scientist at Polar Bears International, gives us her top facts about polar bears and Arctic sea ice.

And we explore whether refreezing parts of the Arctic could be a realistic solution, with Kerry Nickols, from Ocean Visions, a non-profit organisation which looks at ways to protect and restore Arctic sea ice.

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

OnlyFans is an online platform where people create content (photos, videos and live streams), which can be monetised. Although it hosts a variety of content across topics like fitness and cooking, OnlyFans is known widely for hosting adult content, much of it explicit. As its popularity has soared, so too has the controversy and stigma surrounding the platform. Last week, Kurts Adams Rozentals, a world-class British canoeist, revealed that he had been banned from competing by Paddle UK — the sport’s governing body — after they learned he was an OnlyFans content creator. He told the BBC he started posting content because Paddle UK’s annual grant of £16,000 was insufficient to cover rent, travel, food and other expenses associated with full-time training in London.

BBC Business Reporter Charlotte Edwards explains exactly how the platform works and who owns it. She also gives us the latest on the embattled British canoer. Plus: Chimgozirim Nwokoma, a senior reporter for Tech Point Africa, tells us about All Access Fans — an African start-up that have taken inspiration from OnlyFans’ subscription-based business model — and the reaction to it.

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

High school prom may have started off as an American tradition, but now, it’s spread across the globe. In Uganda, proms are often a super lavish event, with couples flying in on helicopters or pulling up in expensive cars, before doing multiple outfit changes through the night. But the government says it’s gone too far — and it’s brought in new rules to curb the celebrations. Uganda’s Ministry of Education has banned what it calls “indecent dressing” and has even introduced a 6PM curfew, arguing that extravagant prom parties put unnecessary financial pressure on parents.

Gloria Achieng, a BBC reporter in Kenya, tells us more about Uganda’s prom culture and what these new rules mean for students. We hear from young people across Uganda, who share their thoughts on the ban with us. And we find out which member of the What in the World team is prom royalty. And how did prom culture start in America?

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