Donald Trump can’t stop talking about Greenland. He spent a big chunk of his speech at the World Economic Forum in Davos talking about the island, saying he wouldn’t use force but threatening consequences if it wasn’t handed over.

Later that day, he said discussions with NATO Secretary General Mark Rutte had been fruitful, but Denmark and Greenland said only they can negotiate with the US over Greenland.

We break down why exactly Donald Trump is paying so much attention to this Arctic island and what that might mean for the rest of the world.

Instagram: @bbcwhatintheworld Email: whatintheworld@bbc.co.uk WhatsApp: +44 330 12 33 22 6 Presenter: Iqra Farooq Producers: Emily Horler and Emilia Jansson Editor: Verity Wilde

Do you know there could be chemicals in your clothes, food packaging and even your make-up which can take hundreds or even thousands of years to break down?

They’re called PFAS - or “forever chemicals” - and they are everywhere. They're in our drinking water, at harmful levels in some areas, and they’re inside our bodies, our brains and our blood. They’ve been found on the top of Mount Everest, too.

BBC climate and science reporter Esme Stallard explains what these chemicals are and how they get into our bodies. Stephanie Metzger from the Royal Society of Chemistry in the UK tells us the effect they can have on our health. And podcast host Robin Laird tells us what she does to try to avoid PFAS.

France has just brought in a ban on cosmetics and clothing that contain these chemicals - they can’t be produced, imported or sold there now. We hear about the steps some countries are taking to try to limit their use. Gittemarie Johansen, a Danish environmental and sustainability advocate, gives us her view on what governments and manufacturers should do.

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

One of the biggest internet personalities in the world, IShowSpeed has gone viral countless times for his ‘irl’ streams from countries all over the globe. His latest tour of Africa has taken him to a bunch of countries so far, including Zambia, Ethiopia and even the newly-crowned AFCON winners Senegal. But the tour has also turned heads for how people have been reacting to it on social media, with some saying it’s completely changed how they look at the continent.

So - is IShowSpeed changing perceptions? Or is he just boosting his personal brand?

The BBC’s West Africa reporter Makuochi Okafor joins us to explain what Speed has got up to so far in Africa, why he’s so popular and the impact his tour is having. And we hear from loads of you across the continent who have been telling us what they think.

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