Witness

Tété-Michel Kpomassie, grew up in West Africa but he was obsessed with the Arctic. When he was 16 years old he ran away from his village in Togo determined to reach Greenland.. It took him eight years but in 1965, he finally arrived. He then went north to fulfil his dream of living among the indigenous people. Years later, he wrote an award-winning account of his odyssey, An African in Greenland, which has been translated into eight languages. Photo: Tété-Michel Kpomassie in Greenland in 1988.(BBC)

In April 1915, Britain mourned when poet and national hero Rupert Brooke died on a troopship in the Dardanelles during World War One. Often compared to a Greek god because of his blond good looks, Brooke had written a series of famous sonnets that reflected the optimistic mood at the beginning of a conflict that would claim tens of millions of lives. Simon Watts introduces the memories of three of Brooke's friends, as recorded in the BBC archives.(Photo: Rupert Brooke. Credit: Culture Club/Getty Images)

Ellen DeGeneres came out as a lesbian publicly in April 1997 – and so did the fictional character she played in her self-titled sitcom. The Puppy Episode would be watched by more than 40 million people and represented a milestone for LGBT representation in popular culture.Lucy Burns speaks to the episode’s writer and executive producer Dava Savel.Picture: Comedian Ellen DeGeneres and actress Anne Heche attend the 49th Annual Primetime Emmy Awards on September 14, 1997 at the Pasadena Civic Auditorium in Pasadena, California. (Ron Galella, Ltd./WireImage)

A record series of arms sales from the UK to Saudi Arabia was worth tens of billions of dollars. The first al-Yamamah deal was agreed between Prime Minister Margaret Thatcher and King Fahd of Saudi Arabia. But the deals were dogged by allegations of corruption. Louise Hidalgo has been speaking to Jonathan Aitken who was involved in later al-Yamamah deals.(Photo: Prime Minister Margaret Thatcher and King Fahd in London in 1987. Credit: Tim Graham/Getty Images)

The assassination of newspaper editor, Lasantha Wickramatunga, shocked the world in 2009. Sri Lanka's civil war between the Sinhalese majority and the Tamil minority was nearing its climax when he was shot dead by gunmen on motorbikes. After his murder his newspaper, the Sunday Leader, printed his final article in which he predicted his own death and wrote that the government would be behind his killing. Farhana Haider has been speaking to his widow, Sonali Samarasinghe, about press freedom in Sri Lanka.(Photo: Journalists and well wishers light candles in front of a photograph of murdered editor Lasantha Wickramatunga on the first anniversary of his death 8 Jan, 2010. Credit: Getty images)

After Apartheid all South Africans, regardless of race, were finally able to vote for the first time in April 1994. Organising the elections was a huge logistical challenge, white supremacists staged terror attacks to try to sabotage the vote and violent clashes between rival political groups threatened to disrupt voting day. Rev Frank Chikane was on the Independent Electoral Commission, the body charged with running the elections, and he explained to Rebecca Kesby how much stress, and joy there was the day all South Africans finally got democracy. (Photo: Nelson Mandela, leader of the ANC (African National Congress) and presidential candidate, voting in the 1994 general election in South Africa. Copyright: BBC)

The Vegan Society was established in 1944 by British 'non-dairy vegetarians'. They wanted to persuade other people not just to give up meat, but milk and eggs too. But the first vegans often got ill, because there was one vital element missing from their diets - vitamin B12. Kirsty Reid has been speaking to former Chair of the Vegan Society, George Rodger, about the history of vegans in the UK.Photo: Fruit, vegetables, nuts and pulses. Credit: Getty creative stock.

In April 1999 Nato bombed the Serbian state TV station in Belgrade, killing 16 people. It was part of a military campaign to force Serbia to withdraw from Kosovo. Mike Lanchin has been speaking to one of the survivors, Dragan Suchovic, a TV technician, who was working at the station that night.Photo: The damage caused by the Nato bombing on the TV station in Belgrade (courtesy of Duco Tellegen, 2015)

On April 20th 1999 a mass shooting in the USA shocked the world and started a devastating trend of violence in American schools. 13 people were killed and more than 20 were injured by two armed school students. Ashley Byrne has been speaking to Craig Scott, who survived the Columbine massacre but whose sister Rachel was killed that day.Photo: Students from Columbine High School run under cover from police, following a shooting spree by two masked teenagers. April 20th 1999. Credit: Mark Leffingwell/AFP/Getty Images.

In the aftermath of World War Two pesticides and chemical fertilisers started to become more widespread in the UK. Worries about the effect this would have on soil quality led Lady Eve Balfour to establish the Soil Association to promote natural farming techniques. John Butler has been a farmer all his life and he has been speaking to Dina Newman about Lady Eve and the early days of Britain's organic farming movement. Photo: Lady Eve Balfour with some of her friends. Copyright: The Soil Association.

In 1959 the German artist Gustav Metzger came up with a new and subversive form of art. He called it auto-destructive art. It was art as a political weapon and a challenge to the established status quo. Metzger, a survivor of the Nazi Holocaust, organised a series of events in London, called the Destruction in Art Symposium, DIAS, and invited radical artists from all over the world, including a relatively unknown young Japanese American, Yoko Ono. Mike Lanchin has been hearing from Welsh artist Ivor Davies, who helped Metzger launch the events and was himself an early pioneer of auto-destructive art.Photo: Gustav Metzger demonstrates his auto-destructive art at London's South Bank, July 1961 (Keystone/Hulton Archive/Getty Images)

'A Raisin in the Sun' opened on Broadway in 1959. It had an almost exclusively black cast and a black director too. The playwright, Lorraine Hansberry, based it on her own family's story of being forced out of a white neighbourhood in Chicago. The title is from a poem by African American poet Langston Hughes about a dream deferred - 'does it dry up like a raisin in the sun?'.Photo: Still from the 1961 film version of the play A Raisin in the Sun featuring Sidney Poitier (Photo by George Rinhart/Corbis via Getty Images)Audio: With thanks to WFMT radio and the Studs Terkel radio archive.

In April 2001 an American multi-millionaire paid Russia's space agency millions of dollars to blast him into space. He spent time on the International Space Station and returned to earth after eight days in space. Dennis Tito, who was 60 years old at the time of his space flight, spoke to Louise Hidalgo in 2011 about his experiences. (This is a rebroadcast)Photo: Dennis Tito immediately after his return to earth. Credit: Alexander Nemenov/AFP/Getty Images.)

Diners at Chinese restaurants in America in the 1960's began to report unusual symptoms, including headaches, flushing, numbness at the back of the neck. It was linked to the man-made flavour enhancer monosodium glutamate or MSG – but it was also part of wider attitudes towards Chinese restaurants at the time.Lucy Burns speaks to restaurateurs Philip Chiang and Ed Schoenfeld about their memories of what became known as 'Chinese restaurant syndrome'.Photo credit: Plates of Chinese food (Dean Conger/Corbis via Getty Images)

In 1990 the president of Bharatiya Janata Party or BJP, LK Advani, embarked on a political and religious rally called the Rath Yatra or chariot march. Championing a politics based on Hindutva or militant Hinduism. Farhana Haider has been speaking to RK Sudhaman a journalist who covered the journey and followed the rise of the BJP.Photo LK Advani during rath yatra 15/10/1990 Credit: Getty Image

The wingsuit is the ultimate in extreme sports clothing. An aerodynamic outfit for BASE jumpers and skydivers it allows them to free-fall for longer before opening a parachute. Skydiver Jari Kuosma developed the first commercial wingsuits and he has been speaking to Jonathan Coates about how exciting, but also how dangerous they can be.Photo: Jari Kuosma. Copyright: BBC

On 13 April 1919, British Indian troops fired on an unarmed crowd at Jallianwala Bagh in Amritsar in the Punjab. Hundreds were killed. The massacre caused an outcry in India and abroad, and would be a turning point for the growing Indian nationalist movement. Lucy Burns brings you eye-witness testimony from the time.Photo: Indian visitors walk past the Flame of Liberty memorial at Jallianwala Bagh in Amritsar. Credit:Narinder Nanu/AFP/Getty Images.

Choreographer Jack Cole had a huge influence on musical theatre and Hollywood films - most memorably with Marilyn Monroe in the film Gentlemen Prefer Blondes. But much of his inspiration came from Indian dance. Vincent Dowd has been speaking to the American actress and singer, Chita Rivera, who danced with him.

Maya Angelou's iconic first memoir, I Know Why the Caged Bird Sings, was published in spring 1969. The book was an instant best-seller, and was one of the first literary accounts of growing up as a black girl in the southern states of America, including graphic depictions of rape and racism. Louise Hidalgo talks to Maya Angelou's friend and biographer, former magazine editor, Marcia Gillespie, about the book and how it helped to establish Maya Angelou as one of the great voices of her generation.Picture: Maya Angelou holding a copy of her memoir, I Know Why the Caged Bird Sings, in 1971 (Credit: BBC/WF/AP/Corbis)

After a brief civil war in March-April 1948, the new president of Costa Rica, Jose Figueres, took the audacious step of dissolving the Armed Forces. Since then Costa Rica has been the only Latin American nation without a standing army. Mike Lanchin has been hearing from 94-year-old Enrique Obregon, who served in the military before its dissolution.Photo: Costa Rican soldiers in San Jose after the end of the civil war, April 1948 (Credit:Getty Images)