The invention of the white LED lightbulb

On New Year's Eve 1999 the Russian President went on TV and said he was leaving office. Tired and emotional, he apologised to the people for the state of the country. Dina Newman spoke to his widow, Naina Yeltsina, about that day. Photo: Russian President Boris Yeltsin with his wife Naina in 1998. Credit: ITAR-TASS POOL/AFP/Getty Images

1 Tammi 20188min

In 1961, Viv Nicholson became a household name in Britain when she and her husband scooped a massive win on the football pools. Asked what she would do with the money, Nicholson famously replied "Spend, Spend, Spend" and the tabloids followed her closely over the next few years as she spent the winnings on the high life. Viv Nicholson's story later became a successful West End musical and stage play. Simon Watts talks to her son, Howard Nicholson, author of "You Don't Know Viv".PHOTO: Howard and Viv Nicholson (left and centre) with British entertainer Bruce Forsyth (Getty Images)

31 Joulu 20179min

How two pilots, Dick Rutan and Jeana Yeager, became the first to fly non-stop around the world without refuelling in December 1986. Their experimental aircraft was designed by Dick's brother, Burt Rutan. It had to be incredibly light to carry the huge weight of fuel required. But that meant the plane was vulnerable to breaking up in turbulence. Dick Rutan and Jeana Yeager endured storms and equipment malfunctions to set the world record. They spent 9 days, 3 minutes and 44 seconds in the air. Alex Last speaks to Dick Rutan about their achievement. Photo: The Voyager aircraft designed by Burt Rutan (NASA).

29 Joulu 201711min

Mountaineers risked their lives to camouflage churches and palaces in the great Russian city during World War Two. The city was besieged by the Germans and under bombardment. The climbers used paint and canvas to conceal the landmarks from enemy attack. Mikhail Bobrov was just 18 years old when first got sent up the city's spires. He's been speaking to Monica Whitlock about his wartime experiences.Photo: A climber suspended from a spire in Leningrad. Credit: Tass/PA.

28 Joulu 20179min

In December 1966, a group of Black activists in Los Angeles created the winter holiday Kwanzaa to try to reclaim their African heritage. It's now celebrated by millions across the US. Lucy Burns speaks to Terri Bandele, who attended the first Kwanzaa celebrations aged 11.Picture: Children at the first Kwanzaa celebration - courtesy of Terri Bandele (on right)

26 Joulu 20179min

The game has become a holiday tradition with families around the world since its launch in 1981. Ashley Byrne has been speaking to the designer of Trivial Pursuit, Michael Wurstlin, about how it was first created.Photo: The original Trivial Pursuit game. Credit: BBC.

25 Joulu 20179min

One of the most successful American films of all time was released on Christmas Day 1962. Written by the best-selling author Harper Lee it starred Gregory Peck as a lawyer who stood against prejudice in the Deep South of the USA. Louise Hidalgo has been speaking to Gregory Peck's son Carey Peck about the film, and about his family's long-standing friendship with the reclusive Harper Lee.Photo: Gregory Peck with the author Harper Lee in 1962. Credit: Getty Images.

22 Joulu 201710min

When Bhimrao Ramji Ambedkar was a schoolboy, he was not allowed to drink from the same tap as his fellow students because he was a member of what was then known as an "untouchable" caste. But he went on to become a prominent leader in the campaign for Indian independence and oversaw the writing of the Indian constitution - which made the idea of "untouchability" illegal. A hero to many, he died in December 1956.Lucy Burns hears recordings of BR Ambedkar from the BBC archives and speaks to biographer Ananya Vajpeyi.Picture: A member of the Indian Congress Party places flowers on a statue of BR Ambedkar to mark the 122nd anniversary of his birth in Amritsar on April 14, 2013 (NARINDER NANU/AFP/Getty Images)

21 Joulu 20179min