Police in Australia are continuing a huge manhunt in the mountains for Dezi Freeman, a man accused of killing two police officers and injuring a third in late August.

Freeman identifies as a sovereign citizen, someone who believes they aren't subject to the law.

In this episode we speak to criminologist Keiran Hardy from Griffith University about the origins of the sovereign citizen movement in the US, how it spread to Australia and was taken up by the self-styled Prince Leonard in the 1970s, and why the movement grew during Covid-19.

This episode was written and produced by Mend Mariwany and Gemma Ware with assistance from Katie Flood and editing help from Ashlynee McGhee. Sound design and mixing by Eloise Stevens and theme music by Neeta Sarl. Read the full credits for this episode and sign up here for a free daily newsletter from The Conversation.

If you like the show, please consider donating to The Conversation, an independent, not-for-profit news organisation.

As China invited world leaders to a vast military parade marking the end of the second world war on September 3, President Xi Jinping said China is "never intimidated by bullies" and would "stand by the right side of history". In a coded message about China's territorial ambitions over Taiwan, Xi added that "the great rejuvenation of the Chinese nation was unstoppable".

China and Taiwan both claim their forces bore the true burden of Chinese resistance against Japan during the second world war, and use this contested history to lay claim to power and territory. Now China is weaponising this history, pushing for a "correct" perspective of the war as it seeks to reshape the world order.

In this episode, historian Meredith Oyen from the University of Maryland, Baltimore County, explains how disagreements between China and Taiwan over who fought the Japanese more than 80 years ago are still raging and why China's military parade raised tensions with Taiwan up another notch.

This episode was written and produced by Mend Mariwany and Gemma Ware with assistance from Katie Flood. Sound design and mixing by Eloise Stevens and theme music by Neeta Sarl. Read the full credits for this episode and sign up here for a free daily newsletter from The Conversation.

If you like the show, please consider donating to The Conversation, an independent, not-for-profit news organisation.

If you’ve ever experienced a state of creative flow, perhaps when writing, playing music, or even gardening, you’ll know that it feels like everything just clicks into place. But what is actually happening inside the brain?

This week, we're re-running an episode first published in June 2024 featuring neuroscientist John Kounios at Drexel University in the US. He scanned the brains of jazz musicians as they were improvising, and revealed the secret ingredients need to achieve a state of creative flow.

This episode was written and produced by Mend Mariwany and Gemma Ware. Sound design and mixing by Eloise Stevens and theme music by Neeta Sarl. Read the full credits for this episode and sign up here for a free daily newsletter from The Conversation.

If you like the show, please consider donating to The Conversation, an independent, not-for-profit news organisation.

AI is transforming the world around us, offering increased productivity and promising to tackle difficult problems like global warming. But behind the scenes, its environmental costs are mounting. From massive energy use to vast quantities of water required to cool data centres, AI’s footprint is growing fast. So, in an age of water scarcity and climate crisis, can we justify this technological boom?

As The Conversation Weekly team takes a production break in August, we're delighted to bring you an episode of LSE IQ, an award-winning, monthly social science podcast produced by a team from the London School of Economics and Political Science. Each episode they ask leading social scientists and other experts to answer one intelligent question and speak to people affected by the issues explored. Like artificial intelligence.

In this episode of LSE IQ which aired in early May, producer Anna Bevan sets out to find out the environmental costs of AI.

This episode was produced and edited by Anna Bevan, with script development from Sophie Mallet and on location sound recording from Oliver Johnson. Mixing help for this episode for The Conversation from Eloise Stevens. Subscribe to LSE IQ here.

Scientists can get animals to do the strangest things. They’ve taught goldfish to drive cars, primates to perform calculations with Arabic numerals and giraffes to do statistical reasoning. But what’s the point?

In this episode, biologist Scarlett Howard from Monash University in Australia – who has taught bees to tell the difference between odd and even numbers – defends the importance of these seemingly ecologically irrelevant experiments.

She argues that they can help us understand the secrets of animal cognition, and even potentially unlock future technological developments for humanity too.

This episode was written and produced by Katie Flood. The host and executive producer is Gemma Ware. Sound design and mixing by Eloise Stevens and theme music by Neeta Sarl. Read the full credits for this episode and sign up here for a free daily newsletter from The Conversation.

If you like the show, please consider donating to The Conversation, an independent, not-for-profit news organisation.

Countries around the world are meeting in Geneva in August to negotiate a global plastics treaty aimed at curbing plastic pollution. The last round of negotiations failed last November after oil-producing countries refused to sign up to a clause calling for the world to reduce its production of plastics.  

But how did the world become hooked on plastic in the first place? This week, we're re-running an episode we first aired in January 2025 featuring an interview with Mark Miodownik, professor of materials and society, at UCL in the UK. He explains the history of plastic, how it’s shaped our lives, and what can be done to make sure more plastic is recycled and less ends up polluting the planet.

This episode was written and produced by Katie Flood and Gemma Ware with assistance from Mend Mariwany. Sound design and mixing by Michelle Macklem and Eloise Stevens and theme music by Neeta Sarl. Read the full credits for this episode and sign up here for a free daily newsletter from The Conversation.

If you like the show, please consider donating to The Conversation, an independent, not-for-profit news organisation.

Donald Trump is suing Rupert Murdoch, alongside the Wall Street Journal and Dow Jones and others, for libel after the Journal published an article alleging that Trump once wrote a “bawdy” birthday letter to the convicted sex offender, the late Jeffrey Epstein. Trump is seeking US$10 billion in damages.

Trump and Murdoch have a transactional friendship that goes back decades. Despite past tensions, this rupture is something new in a relationship that has continued to serve both men’s interests.

In this episode, professor of journalism Andrew Dodd at the University of Melbourne takes us back to where their relationship began in 1970s New York, to understand how Murdoch helped to build brand Trump.

This episode was written and produced by Mend Mariwany and Gemma Ware with editing help from Ashlynne McGhee. Sound design and mixing by Eloise Stevens and theme music by Neeta Sarl. Read the full credits for this episode and sign up here for a free daily newsletter from The Conversation.

If you like the show, please consider donating to The Conversation, an independent, not-for-profit news organisation.

Israel has never officially confirmed or denied having nuclear weapons and has never signed the nuclear non-proliferation treaty. Instead, even as evidence has emerged about its nuclear capabilities, Israel has maintained a policy of nuclear ambiguity.

The origins of this opacity lie in a secret deal forged in a one-on-one meeting between Israeli prime minister, Golda Meir, and the US president, Richard Nixon, at the White House in September 1969.

In this episode, we speak to Avner Cohen, professor of non-proliferation studies at the Middlebury Institute of International Studies at Monterrey in the US, about that 1969 deal and why it has endured for more than 50 years. 

This episode was written and produced by Mend Mariwany and Gemma Ware with assistance from Katie Flood and Ashlynne McGhee. Sound design and mixing by Eloise Stevens and theme music by Neeta Sarl. Read the full credits for this episode and sign up here for a free daily newsletter from The Conversation.

If you like the show, please consider donating to The Conversation, an independent, not-for-profit news organisation.

The majority of the world’s rechargeable batteries are now made using lithium-ion. Most rely on a combination of different rare earth metals such as cobalt or nickel for their electrodes. But around the world, teams of researchers are looking for alternative – and more sustainable – materials to build the batteries of the future.

In this episode, we speak to four battery experts who are testing a variety of potential battery materials about the promises they may offer.

Featuring Laurence Hardwick from the University of Liverpool, Robert Armstrong from the University of St Andrew's, Ulugbek Azimov from Northumbria University and Bill Yen from Stanford University.

Applications are now open for early career researchers to submit their projects for the Prototypes for Humanity 2025 awards and showcase in Dubai.

This episode was written and produced by Gemma Ware with assistance from Mend Mariwany and Katie Flood. Sound design and mixing by Eloise Stevens and theme music by Neeta Sarl. Read the full credits for this episode and sign up here for a free daily newsletter from The Conversation.

If you like the show, please consider donating to The Conversation, an independent, not-for-profit news organisation.

 Across Europe, far-right movements are gaining ground. By normalising nationalist rhetoric and challenging democratic institutions, these parties raise comparisons with former periods of fascism on the continent. Between 1943 and 1945, when Nazi forces occupied northern Italy, ordinary people in towns and villages across the country took up arms against fascism in one of Europe’s largest resistance movements. Now, 80 years later, in many of these same towns, anti-fascist sentiment remains unusually strong.

In this episode, we speak to political scientist Juan Masullo at Leiden University, who’s been finding out about the enduring legacy of these partisan movements.

This episode was hosted by Gemma Ware and written and produced by Mend Mariwany. Sound design and mixing by Eloise Stevens and theme music by Neeta Sarl. Read the full credits for this episode and sign up here for a free daily newsletter from The Conversation.

If you like the show, please consider donating to The Conversation, an independent, not-for-profit news organisation.