Julian Assange, one of the world’s most notorious hackers and the face of the website Wikileaks, is now a free man. He’s been in a high security prison in the UK for the last five years, fighting extradition to the US, wanted for charges under the US Espionage Act. But who is he and what did he do?

We talk you through Julian Assange’s hacker background, some of Wikileaks' biggest revelations and controversies and how he ended up living at the Ecuadorean embassy in London for nearly seven years.

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

A pair of beluga whales have been evacuated from the besieged city of Kharkiv in Ukraine. They were taken to Europe’s largest aquarium — the Oceanogràfic de Valencia in Spain.

Mora from the What in the World team explains how the ongoing war in Ukraine put the belugas at risk. And Daniel Garcia-Párraga, director of zoological operations at Oceanogràfic, describes the complex rescue mission.

The evacuation of the belugas has sparked discussions about animal captivity more generally. Rob Lott from the wildlife charity Whale and Dolphin Conservation tells us how perceptions of aquariums are changing around the world. Jeffrey Ventre, a former trainer at SeaWorld in Florida, describes what life at the aquarium was like for Tilikum — the killer whale that was the focus of 2013 documentary Blackfish.

Finally, we meet Hot Pink Dolphins, which describes itself as Korea’s first aquarium dolphin liberation movement. One of its activists Oh Yeon-jae explains why she's committed to protecting endangered marine life and returning animals to the wild.

Instagram: @bbcwhatintheworld WhatsApp: +44 0330 12 33 22 6 Email: whatintheworld@bbc.co.uk Presenter: William Lee Adams and Mora Morrison Producer: Mora Morrison Editor: Verity Wilde

There’s been a lot of unrest in New Caledonia this year and it’s down to a proposed voting reform bill. Buildings have been set on fire, nine people have been killed and seven pro-independence activists have been detained and taken to France.

New Caledonia is a French territory, even though it’s really far away from France. Many local people there want independence. The BBC’s Malu Cursino gives us some background on New Caledonia and explains why there have been protests.

And Shawn Yuan from the BBC’s Global China Unit explains why China has interest in New Caledonia.

Instagram: @bbcwhatintheworld WhatsApp: +44 0330 12 33 22 6 Email: whatintheworld@bbc.co.uk Presenter: William Lee Adams Producer: Emily Horler and Baldeep Chahal Editor: Verity Wilde