It's 50 years since a chance find by Chinese farmers led to an astonishing archaeological discovery.

Thousands of clay soldiers were uncovered in the province of Shaanxi after being buried for more than 2,000 years.

They were guarding the tomb of the ancient ruler Qin Shi Huang, who ruled the Qin Dynasty.

In 2013, archaeologists Yuan Zhongyi and Xiuzhen Li told Rebecca Kesby about the magnitude of the dig, and how unearthing the incredible statues shaped their careers.

(Photo: Terracotta soldiers stand to attention. Credit Marica van der Meer/Arterra/Universal Images Group/Getty Images)

Between 1932 and 1945, hundreds of thousands of women and girls across Asia were forced into sexual slavery by the Imperial Japanese Army.

Referred to as "comfort women", they were taken from countries including Korea, China, Taiwan, the Philippines and Indonesia to be raped by Japanese soldiers.

Today, the issue remains a source of tension between Japan and its neighbours, with continuing campaigns to compensate the few surviving victims.

Dan Hardoon speaks to Chinese survivor Peng Zhuying who, along with her elder sister, was captured and taken to a "comfort station" in central China.

This programme contains disturbing content.

(Photo: People visit a museum dedicated to the victims, on the site of a former comfort station in China. Credit: Yang Bo/China News Service/VCG/Getty Images)

In 1968, Jingyu Li and her parents were among hundreds of thousands of Chinese people sent to labour camps during Mao Zedong’s so-called cultural revolution.

The aim was to re-educate those not thought to be committed to Chairman’s Mao drive to preserve and purify communism in China.

Jingyu’s parents – both college professors - were put to work among the rice and cattle fields, and made to study the works of Chairman Mao. Fearful for their daughter’s safety, they disguised six-year-old Jingyu as a boy.

Over the next six years, the family were sent to four different camps. Not everyone could cope, as Jingyu tells Jane Wilkinson.

(Photo: Reading Mao's little red book in 1968. Credit: Pictures from History/Getty Images)

In 1958, a brand new writing system was introduced in China called Pinyin. It used the Roman alphabet to help simplify Chinese characters into words.

The mastermind behind Pinyin was a professor called Zhou Youguang who'd previously worked in the United States as a banker.

Pinyin helped to rapidly increase literacy levels in China. When it was introduced, 80% of the population couldn't read or write. It's now only a couple of percent.

Despite being responsible for such an important tool in China's development, Zhou was subjected to re-education as part of Mao Zedong's Cultural Revolution in the 1960s. He was forced to work on a farm in rural China.

In 2017 Zhou Youguang died aged 111. Matt Pintus has been going through archive interviews to piece together Zhou's life.

This programme contains archive material from NPR and the BBC.

(Photo: Zhou Youguang. Credit: Bloomberg/Getty Images)

The Mount Vesuvius eruption that buried Pompeii in 79AD is well known, but far fewer people know about the last time the volcano erupted in 1944.

It was World War Two, and families in southern Italy had already lived through a German invasion, air bombardment, and surrender to the Allies.

And then at 16:30 on 18 March, Vesuvius erupted. The sky filled with violent explosions of rock and ash, and burning lava flowed down the slopes, devastating villages.

By the time it was over, 11 days later, 26 people had died and about 12,000 people were forced to leave their homes.

Angelina Formisano, who was nine, was among those evacuated from the village of San Sebastiano. She’s been speaking to Jane Wilkinson about being in the path of an erupting volcano.

(Photo: Vesuvius erupting in March 1944. Credit: Keystone/Getty Images)

Winifred Atwell was a classically-trained pianist from Trinidad who became one of the best-selling artists of the 1950s in the UK.

She played pub tunes on her battered, out-of-tune piano which travelled everywhere with her.

Her fans included Sir Elton John and Queen Elizabeth II.

She was the first instrumentalist to go to number one in the UK.

This programme, produced and presented by Vicky Farncombe, tells her story using archive interviews.

(Photo: Winifred Atwell. Credit: BBC)

In 1992, Guarani was designated an official language in Paraguay’s new constitution, alongside Spanish.

It is the only indigenous language of South America to have achieved such recognition and ended years of rejection and discrimination against Paraguay’s majority Guarani speakers.

Mike Lanchin hears from the Paraguayan linguist and anthropologist David Olivera, and even tries to speak a bit of the language.

A CTVC production for the BBC World Service.

(Photo: A man reads a book in Guarani. Credit: Norberto Duarte/AFP/Getty Images)

In 1992 off the coast of Ireland, a Swiss geology student accidentally discovered the longest set of footprints made by the first four-legged animals to walk on earth.

They pointed to a new date for the key milestone in evolution when the first amphibians left the water 385 million years ago. The salamander-type animal which was the size of a basset hound lived when County Kerry was semi-arid, long before dinosaurs, as Iwan Stössel explains to Josephine McDermott.

(Picture: Artwork of a primitive tetrapod. Credit: Christian Jegou/Science Photo Library)

A regular morning turned into a day of nightmares for Spanish commuters on 11 March 2004.

In the space of minutes, 10 bombs detonated on trains around Madrid, killing nearly 200 people and injuring more than 1,800.

With a general election three days away, the political fall-out was dramatic.

In 2014, two politicians from opposite sides told Mike Lanchin about that terrible day – and what happened next.

(Photo: The wreckage of a commuter train. Credit: Bruno Vincent/Getty Images)

On 8 March 2014, a plane carrying 239 passengers and crew disappeared.

What happened to missing flight MH370 remains one of the world's biggest aviation mysteries.

Ghyslain Wattrelos’ wife Laurence and teenage children Ambre and Hadrien were on the plane, which was on its way to Beijing from Kuala Lumpur.

He was on a different flight at the time and only found out the plane was missing when he landed.

A decade on, Ghyslain tells Vicky Farncombe how he’s no closer to knowing what happened to his family.

“I am exactly at the same point that I was 10 years ago. We don't know anything at all.”

(Photo: Ghyslain Wattrelos. Credit: Pacific Press/LightRocket via Getty Images)