What in the World

• Why are some sugary drinks more expensive?

  Sugar taxes are in place in several countries including Mexico and the UK. And they’re evolving. Maybe you’ve noticed that some sweet fizzy drinks are getting more expensive? Buying drinks with added sugar has an extra cost, which is commonly known as sugar tax. It’s a way to discourage people from consuming too much sugar - something which can lead to poor health if consumed in excess. But do these sugar taxes work? Our BBC colleague Maria Clara Montoya has been looking into this with the help of Elisa Pineda, a public health expert from The George Institute for Global Health at Imperial College London.Instagram: @bbcwhatintheworld Email: [email protected] WhatsApp: +44 330 12 33 22 6 Presenter: Iqra Farooq Producers: Mora Morrison and Maria Clara Montoya Editor: Verity Wilde

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• Could this be the most valuable shipwreck in the world?

  Colombian archaeologists have retrieved the first items from what’s thought to be the most valuable shipwreck in the world. A Spanish naval ship, the San José, was sunk by a British fleet off the coast of Colombia more than 300 years ago. It had a cargo of gold, silver and emeralds worth billions of dollars in today’s money. Treasure hunters had tried to locate the shipwreck for many years, before Colombia announced that it had discovered it back in 2015.But how can we be sure this is the actual San Jose - and if it is, who has the rightful claim to the precious cargo onboard?Helen Farr, a marine archaeologist from the University of Southampton in the UK, takes us through the legal dispute over who owns the ship, and recounts how it ended up on the ocean floor. And we hear from Mariana Carulla, a conservationist in the Colombian ministry of culture, who has been working with the team that’s retrieving objects from the shipwreck. She tells us what they have found so far - and explains how authorities are searching for clues about the shipwreck’s true identity.Instagram: @bbcwhatintheworld Email: [email protected] WhatsApp: +44 330 12 33 22 6 Presenter: Hannah Gelbart Producers: Emily Horler, Maria Clara Montoya and Chelsea Coates Editor: Verity Wilde

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• Are we in the age of trillionaires?

  Elon Musk could be about to become the world’s first trillionaire. That’s after a record-breaking pay package - that could be worth nearly $1tn (£760bn) - was approved by Tesla shareholders. The electric car boss is already the world's richest man, but this would take his wealth to a whole new level. But who is Elon Musk and how did he make all this money? We explain all, as well as breaking down what a trillion dollars actually is. Plus, we hear from two special guests about what they would do with a trillion dollars.But not everyone thinks trillionaires are a good thing. Billie Eilish has been vocal about this. She recently called for billionaires to give their money away. And then there’s charities, like Oxfam, who point to rising global inequality. BBC reporter Nathalie Jimenez joins us to crunch the numbers, and explain all sides of the arguments for, and against, trillionaires. Instagram: @bbcwhatintheworld Email: [email protected] WhatsApp: +44 330 12 33 22 6 Presenter: Hannah Gelbart Producers: Mora Morrison, Chelsea Coates and Emily Horler Video producer: Baldeep Chahal Editor: Verity Wilde

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• Do students learn best in their first language?

  Children learn best when they’re taught in the language they use at home, research suggests. But there's the question about the power of world languages like English, Spanish, French or Arabic and how they could provide more opportunities to those who learn it, be it in education or a career. You’ve been messaging us about what languages you learned in at school. Say hello to Brian in Kenya and Christian in the Philippines!We then skip over to Nigeria, where our reporter Makuochi Okafor breaks down for us why the government is reversing its policy of teaching in other languages that aren't English. And our colleague Santiago tells us what went wrong when he was learning in English in his Colombian school. Plus, we get the research from Justine Sass, from UNESCO - the UN agency for education, science and culture.Instagram: @bbcwhatintheworld Email: [email protected] WhatsApp: +44 0330 12 33 22 6 Presenter: Hannah Gelbart Producers: Julia Ross-Roy, Chelsea Coates, Maria Clara Montoya and Emily Horler Editor: Verity Wilde

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• Why your plane’s GPS might be sabotaged (but don’t be scared)

  GPS interference or GPS ‘jamming’ is getting more common. It’s when radio signals on the same frequencies as GPS satellites are used to overwhelm and block legitimate navigation signals. It’s led to pilots having to make emergency landings or switch to older non-GPS systems. The issue has become so prevalent that the European Union Aviation Safety Agency (EASA) held a conference on it last year. Several European governments also believe it is intentional interference by Russia. BBC journalist Emilia Jansson explains GPS jamming in detail and how it is affecting the aviation industry.Plus we hear from Ian Petchenik, director of communications at flight-tracking website Flightradar24 about what GPS interference looks like in real-time.Instagram: @bbcwhatintheworld Email: [email protected] WhatsApp: +44 330 12 33 22 6 Presenter: Hannah Gelbart Producer: Emilia Jansson and Benita Barden Editor: Verity Wilde

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