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By BBC World Service
The best documentaries from the BBC World Service. Hear the voices at the heart of global stories. Where curious minds can uncover hidden truths and make sense of the world.
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The podcast currently has 3,356 episodes available.
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Forty years ago, an iceberg broke away from the Antarctic ice shelf. But this was no ordinary iceberg. A colossal chunk of ice which covered an area twice the size of London, it was as deep as the Empire State building is high and it weighed a trillion tonnes. For nearly four decades A23a was the world’s largest iceberg. Glaciologist Dr. Catherine Walker tells the story of A23a from its origins, its ice being laid down deep in the Antarctic over millennia, through to its final chapter - shrinking, melting and feeding the ocean from which it came. Catherine talks to glaciologists who study the vast cracks which propagate across the Antarctic ice shelf and to scientists who have seen A23a up close and followed its journey and its impact as it released a trillion tonnes of fresh water and nutrients into the marine environment.

Evidence suggests that millions around the world are ditching the most popular dating apps to pursue alternative options. Users complain that swiping is not leading to dates or meaningful relationships, just admin and fatigue. In our conversations, organisers of in-person dating events share their experiences. Amber tells us. “You could like someone’s photo, you could like speaking to them on the phone but when you meet them in person there’s something different that can’t be assessed online – that’s a big part of why people are coming back to in-person events.” We also bring together developers of specialist dating apps, including an advocate of “slow dating.”

On 11 September 2001, suicide attackers hijacked two passenger planes flying over the eastern United States and crashed them into the Twin Towers of the World Trade Center in New York, causing both buildings to collapse. The attack killed 2,753 people. As smoke billowed from the burning towers, firefighters, police officers and paramedics from across New York City raced to the scene, climbing stairwells packed with fleeing civilians in an effort to reach those trapped. When the towers fell, hundreds of first responders were still inside, and in the years since, even more have died from illnesses linked to their time working in the toxic dust of Ground Zero. Twenty-five years on, Kirsty Wark travels to New York to bring together the first responders and survivors who lived through that morning. New York Fire Department Battalion Chief Joseph Pfeifer was the first commander on the scene, and later became planning chief for the rescue and recovery effort at Ground Zero. Office worker Richard Eichen, who escaped from the 90th floor of the North Tower. Jill Pila, whose husband Jim Gartenberg worked on the 86th floor. Former NYPD officer Judy Castro, who rushed to the North Tower to help evacuate the building. St John's Hospital paramedic Jimmy Dobson, who spent the day bringing the injured to safety from the streets surrounding Ground Zero. Rear Admiral Michael Day, who coordinated the evacuation of an estimated 500,000 people off the island of Manhattan later that day. And the novelist A.M. Homes, a longtime resident of New York, who witnessed the events of the day unfold from her apartment in Lower Manhattan.

AI cameras, drones, licence plate readers, sound detection, Flock - the United States is monitored through a growing, high-tech, and increasingly interconnected surveillance network. In some cities, like Houston, Texas, the true extent of this system is a secret. Law enforcement says this is all for public safety - to prevent crime and assist investigations. Critics think it is an invasion of privacy, open to misuse, and a sneaky tool aiding ICE in President Trump’s deportation drive. One company is bearing the brunt of the backlash: Flock Safety. Its network of AI-powered licence plate readers spans over 6000 communities, generating 20 billion vehicle scans a month. Vigilantes have been cutting down Flock devices. Social media is full of tips on how to obstruct or disable the cameras. Ellie House is in Houston, Texas, to investigate the surveillance network authorities do not want you to know about. She sees how Flock has been used by police to fight crime, gets inside the anti-surveillance techlash, and she sits down with Flock CEO Garrett Langley in his Atlanta HQ. This episode of The Documentary, comes to you from Assignment.

Presenter Becky Green lost one of her twins to sepsis in 2018. It is a condition that, according to the World Health Organization, is implicated in one in five deaths worldwide - more than bowel, prostate and lung cancer combined. Sepsis can begin as a simple infection and escalate within hours, overwhelming the body and causing organ failure. It is a race against time that too often goes unrecognised until it is too late. But around the world, that is starting to change. Becky speaks to Dr Kissoon of the Global Sepsis Alliance about how our understanding of sepsis has changed. In Malawi and Uganda, she meets the team behind the APT Sepsis programme. By educating healthcare workers on hand hygiene, infection prevention and early detection they have cut maternal deaths and severe infections from sepsis by 32%. In Madrid, Dr Rosa Mendez explains how a hospital-wide "sepsis code" - mirroring fast-track protocols for heart attacks and strokes - has brought sepsis mortality down from 24% to 17%. This episode of The Documentary, comes to you from People Fixing the World, looking at people and projects trying to make the world a better place.
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