Zimbabwe has a brand new currency; it’s called the ZiG (Zimbabwe Gold) and it’s backed by the country’s gold reserves. This is the third time they’ve launched a new currency in ten years and 80% of transactions in the country are now carried out in US dollars. Can the government persuade its citizens that this one will remain stable and not deflate?

The BBC’s Zimbabwe correspondent Shingai Nyoka explains how people pay for stuff in the country and why the government has brought in a new currency. Two guys in Harare tell us what they make of the ZiG, and whether they’re using it instead of the US dollar.

Also Baldeep Chahal from the What in the World team brings us some other examples of countries changing their currency and chats about whether it ever works.

Instagram: @bbcwhatintheworld WhatsApp: +44 0330 12 33 22 6 Email: whatintheworld@bbc.co.uk Presenter: Alex Rhodes Producers: Julia Ross-Roy and Baldeep Chahal Editor: Verity Wilde

Demonstrations over the war in Gaza have taken place at several universities in the US over the past few weeks.

They have spanned from Colombia University in New York, to universities in Chicago, Texas and California.

In the last month, more than a thousand people have been arrested.

The BBC’s North America Correspondent Nomia Iqbal explains what has been happening and how this might affect the upcoming US election.

And Bernd Debusmann Jr tells us about the history of student demonstrations in America.

Instagram: @bbcwhatintheworld WhatsApp: +44 0330 12 33 22 6 Email: whatintheworld@bbc.co.uk Presenter: Hannah Gelbart Producers: Emily Horler, Maria Clara Montoya, Josh Jenkins and Adam Chowdhury Editor: Verity Wilde

Nature conservation is effective at protecting animals and plants - and we’re getting better at it. That’s according to a new major study published in the journal Science. Esme Stallard, a BBC climate and science reporter, explains what conservation is, where it’s worked (including for humpback whales), and why we need it.

Plus, we hear from two people who work in conservation. Charles Emogor has a PhD in pangolins and is from Nigeria. He shares why he loves them and how he’s saving them from being hunted. And Aiita Joshua Apamaku, from Uganda, tells us why he finds conservation so exciting.

Instagram: @bbcwhatintheworld WhatsApp: +44 0330 12 33 22 6 Email: whatintheworld@bbc.co.uk Presenter: Hannah Gelbart Producers: Mora Morrison, Baldeep Chahal and Sophie Smith Editor: Verity Wilde