As Darcey Bussell takes her final curtain call, she reflects on nearly 20 years as principal dancer of the Royal Ballet in London. Bussell talks to Louise Minchin and explains why she is retiring at the peak of her powers

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The destruction of the twin towers was a site that became the definition of terror. It was an onslaught that killed nearly three thousand people - but a decade later, the attack isn't over. The dust that overwhelmed the streets of Lower Manhattan became a weapon. The clouds contained particles of pulverized concrete, asbestos, lead from fifty thousand computers, mercury from countless light bulbs -- a million tons of poisonous fallout. Now nearly 20,000 people are receiving treatment for a range of illnesses, many of them serious. And more than 60,000 are registered as at risk. The BBC Our World team first broke the story globally in 2006. They return 5 years later to investigate a worsening tragedy and followup with those who shared their stories.

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As a wave of protests and self-immolations continues against the rule of China on the Tibetan plateau, Sue Lloyd-Roberts asks the Dalai Lama if the dream of increased independence for Tibet is dead.

In 2015, Iran agreed a long-term deal on its nuclear program with a group of world powers known as the P5+1 - the US, UK, France, China, Russia and Germany. Our World reports on the process that led to the agreement.

More Americans die from drug doses than car crashes or gun fatalities. The majority of the deaths involve the use of heroin or prescription painkillers. Over the past year, Ian Pannell has followed a number of addicts as they try to kick the habit.

Gabriel Gatehouse reports from Louisiana. How much of a difference did Barack Obama's presidency make to the lives of African-Americans?

Our World investigates allegations of mass murder and rape among Myanmar's displaced Rohingya minority. Asking why Burmese leader and democracy icon Aung San Suu Kyi has failed to stop what the UN is calling crimes against humanity.

A brilliant student, Mashal Khan, was brutally murdered by a mob on a university campus in Pakistan earlier in 2017 after he was accused of blasphemy. The killing caused widespread outrage in Pakistan and has even led to calls to change the country's strict blasphemy laws. Who was Mashal Khan and why was he murdered? Secunder Kermani investigates.

In Ukraine more than 30 thousand children with disabilities are living in state run institutions. A few are orphans but most have families, yet spend much of their lives in children's homes, some in shockingly bad conditions. The Government of Ukraine has vowed to end this practice, with the most radical reforms the country has seen since it gained its independence from the Soviet Union 26 years ago. Nikki Fox, the BBC's disability news correspondent, has this exclusive report.

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For centuries, a significant Sikh minority has grown in relative safety in Afghanistan. But, in the last decade, persecution has seen the population drop.

In northern Europe's Lapland, temperatures are rising faster than anywhere else in the world, threatening the livelihood of its indigenous Sami people. Central to Sami life is the ancient practice of reindeer herding, but climate change is putting the reindeer at risk of starvation. Many Sami also worry that plans to build a railway, to exploit Lapland's natural resources, will add to the pressure on their traditional way of life. For Our World, Erika Benke has been to Arctic Finland to hear from Sami women about their fears for the future.

Google, Apple and Facebook-owned Instagram are enabling an illegal online slave market by approving and providing apps used for selling domestic workers in the Gulf. For Our World, BBC News Arabic’s undercover investigation exposes the people in Kuwait breaking local and international laws on modern slavery, including a woman offering a child for sale. At the centre of this powerful investigative film is Fatou a 16 year old in Kuwait City who has been there for nine months. We follow her rescue and journey back home to Guinea, West Africa and ask what’s being done to control these apps?

For five months protests have rocked Hong Kong, pitting hundreds of thousands of young, idealistic demonstrators against the authorities and the might of China. The clashes between police and protestors have become increasingly violent and neither side shows signs of backing down. Our World goes beyond the frontline to tell the stories of some of those involved, what drives them - and their hopes and fears for the future.

Colombia has long been the world's largest producer of cocaine. A historic peace deal in 2016 was meant to reduce the amount of cocaine being produced by offering farmers alternatives to growing coca. But last year the UN estimated that its output was the largest since records began. Our World traveled to the Cauca Valley to find that farmers are now being caught between new criminal gangs with devastating consequences.

In October 2019, a rising star of Syrian democratic politics, 34-year-old Hevrin Khalaf, was brutally murdered in the Kurdish-governed north east of the country.

In 2017 a group of fishermen found a hoard of precious coins on the sea bed off the coast of Gaza. They were decadrachms from the reign of Alexander the Great- and they were worth a fortune. 3 years on, they have disappeared. So what happened to them, and why are rare coins so hard to trace?

Antarctica is one of the most remote and inhospitable places on earth. Reporter Justin Rowlatt travels to Thwaites, the so-called Doomsday Glacier.

Panzuto was a mafia boss, and a hardened killer. For years he played a key role in Naples' Camorra, but now he has turned state witness and is helping put his former associates behind bars. Dominic Casciani gains exclusive access to an Italian anti-mafia prison to meet Panzuto and hear his story of love, murder and betrayal. It's a tale which took him from the back streets of Naples to a caravan park in Blackpool. We hear from those at the sharp end of the ongoing battle against organised crime in Naples, and from those who believe the tide has finally turned. Above all we hear from the man himself: why did he decide to break with the Camorra, and what does the future hold for him?

Our World gained unprecedented access to enter Indonesia’s prison to witness both Garil and Sarah meeting the bombers who killed their parents.