We’ve seen more and more women talking about cycle-syncing. It’s where you adjust your diet and work outs to match the different phases of your period. Things like eating more in certain phases or taking it easy in others.

But does cycle-syncing help you get better results? Does the science back it up or is it just another wellness trend and rule book for women to follow?

BBC reporter Zara Salaria takes us through what cycle syncing is, we hear from people who have tried it and a doctor breaks it down for us: does it work?

Instagram: @bbcwhatintheworld Email: whatintheworld@bbc.co.uk WhatsApp: +44 330 12 33 22 6 Presenter: Hannah Gelbart Producers: Emily Horler and Benita Barden Video Journalist: Baldeep Chahal Editor: Verity Wilde

Globally more than a billion tonnes of food is wasted each year and much of it ends up in landfills. As the food breaks down it releases huge amounts of methane, making up 10% of the world’s climate-warming emissions. Now many cities and governments are looking to South Korea as a model of how to reduce food waste and boost food recycling.

BBC reporter Soo Min Kim explains how South Korea cut household food waste going to landfill from 97% to almost nothing. Among other things, they’ve nudged the public to think about their food waste by making it mandatory to separate food waste and to pay for throwing it away. The country also has special RFID bins to handle disposal and payments, and there are financial penalties for people who don’t comply.

We also hear from content creators around the world about how they reduce their food waste. They are: Senjuti Chakraborty in India, Debbi Love in the UK, and Chatty Miss Maddie and Lani Marschall in Australia. Plus BBC reporter William Lee Adams shares some of the surprising food saving hacks he came across on social media.

Instagram: @bbcwhatintheworld Email: whatintheworld@bbc.co.uk WhatsApp: +44 330 12 33 22 6 Presenter: Iqra Farooq Producer: William Lee Adams Editor: Verity Wilde

You may have seen whimsy all over your socials this year. Maybe you’ve been trying to make your days more whimsical? To some, that means taking a moment to appreciate the small things in life: the way the light falls on your desk in the afternoons, or a slow moment spent watching the way the trees blow in the wind. But now, rhinestones have entered the chat and the trend seems to have evolved into something entirely different. There are now concerns that it’s turned into over-consumerism, with people buying gems and other items to be whimsy. When some argue that whimsy simply cannot be bought.

We speak to content creators Karris & Elizabeth about what whimsy means to them. Mollie from the What in the World team talks us through how the trend has grown. And we break down the evolution of whimsy with pop culture writer, Alyssa, and de-influencer, Emma.

Instagram: @bbcwhatintheworld Email: whatintheworld@bbc.co.uk WhatsApp: +44 330 12 33 22 6 Presenter: Hannah Gelbart Producers: Mollie Perella and Benita Barden Editor: Verity Wilde