Gürtel scandal: Spain's Watergate

The Colombian drug trafficker, once one of the richest men in the world, was shot dead by police on 2nd December 1993. He had been on the run from the authorities for over a year. Jordan Dunbar has been speaking to Elizabeth Zilli who worked for the US Drug Enforcement Agency in Colombia and who helped track down Pablo Escobar.Photo: Colombian police and military forces storm the rooftop where drug lord Pablo Escobar was shot dead just moments earlier during an exchange of gunfire between security forces and Escobar and his bodyguard on 2nd December 1993. (Credit:Jesus Abad-el Colombiano/AFP/Getty Images)

2 Dec 20199min

Robert R was a teenager who died of a mysterious illness in Saint Louis, Missouri in 1969. It was only in the 1980s that doctors studying the Aids epidemic realised Robert had died of Aids. Ned Carter Miles has been speaking to Dr Memory Elvin Lewis was one of the doctors who treated Robert R. She was so intrigued by his case that she kept tissue samples after his death, which later proved that he had contracted HIV/Aids.Photo: HIV particles, computer artwork. HIV is the virus that causes AIDS. Credit: Science Photo Library

29 Nov 20198min

In 1985 Australia's most famous natural landmark, Uluru, the huge ancient red rock formerly known as Ayers Rock, was handed back to its traditional owners, the indigenous people of that part of central Australia, the Anangu. But as one of the government officials involved in the negotiations for the transfer, former private secretary for aboriginal affairs, Kim Wilson, tells Louise Hidalgo, not everyone in Australia was pleased.Picture: Uluru, formerly Ayers Rock, in Kata Tjuta National Park, the world's largest monolith and an Aboriginal sacred site (Credit: Jeff Overs/BBC)

28 Nov 20199min

In the early 1950s, the leading British catering firm, J Lyons & Co, pioneered the world's first automated office system. It was baptised LEO - the Lyons Electronic Office - and was used in stock-taking, food ordering and payrolls for the company. Soon it was being hired out to UK government ministries and other British businesses. Mary Coombs worked on the first LEO and was the first woman to become a commercial computer programmer. She tells Mike Lanchin about her memories of those heady days when computers were still in their infancy. Photo: LEO 2 in operation, 1957 (Thanks to The LEO Computers Society for use of archive)

27 Nov 201910min

In the 1990s India began to open up its largely state-controlled economy to foreign investment. Subramanian Swamy wrote the blueprint for reform and he's been speaking to Iknoor Kaur about what worked - and what didn't.Photo: Subramanian Swamy (r) with Manmohan Singh. Credit: Getty Images.

26 Nov 20198min

American scientist Dennis Klatt pioneered synthesised speech in the 1980s. He used recordings of himself to make the sounds that gave British physicist Stephen Hawking a voice when he lost the ability to speak. Friend and colleague of Dr Klatt, Joseph Perkell, told Rebecca Kesby about the man who gave his voice to Prof Hawking allowing him to educate the world in science. (Photo: BOMBAY, INDIA: World-renowned physicist Stephen Hawking answers questions with the help of a voice synthesiser during a press conference at the Tata Institute of Fundamental Research (TIFR) in Bombay, 06 January 2001. Credit AFP)

25 Nov 201910min

In the 1940s, British gentleman explorer Wilfred Thesiger travelled extensively in one of the world's harshest environments - the Empty Quarter of Arabia. Thesiger lived with nomads in order to cross a desert that was then considered a place of mystery and death. He captured a final glimpse of their way-of-life before the arrival of the oil industry, and was inspired to write the classic travel book Arabian Sands. Simon Watts introduces recordings of Wilfred Thesiger in the BBC archive.PHOTO: Wilfred Thesiger (Pitt Rivers Museum via Bridgeman Images)

22 Nov 20199min

India's capital city built a brand new mass transit system to tackle its traffic jams and air pollution. The first section of the Delhi Metro was opened to the public in 2002. E Sreedharan was managing director of the Metro project and he's been speaking to Prabhat Pandey about the challenges he faced. Photo: the inside of a Delhi Metro carriage. Credit: Getty Images.

21 Nov 20198min