Max Pearson presents a collection of the week's Witness History interviews from the BBC World Service.

Our guest is Dr Nivi Manchanda, a reader in international politics at Queen Mary University in London.

First, a moment when two cultures clashed in 1985 at Stonehenge.

We hear about an English language novel from 1958, called Things Fall Apart.

Then, the 1992 creation of the iconic Champions League anthem.

Plus, how police raided the popular but controversial file-sharing website The Pirate Bay in 2006.

Finally, how Canadian rock band The Tragically Hip went on one final tour, after their guitarist was given months to live in 2015.

Contributors:

Helen Hatt - one of more than 500 people arrested at the Battle of the Beanfield. Dr Nivi Manchanda - reader in international politics at Queen Mary University in London. Nwando Achebe - Chinua Achebe's youngest daughter. Tony Britten - composer of the Champions League anthem. Peter Sunde - co-founder of The Pirate Bay. Rob Baker - lead guitarist in the Tragically Hip.

(Photo: Stonehenge protests. Credit: PA/PA Archive/PA Images)

Max Pearson presents a collection of the week's Witness History interviews from the BBC World Service.

The expert guest is Dr Mirjam Brusius, a research fellow in colonial and global history at the German Historical Institute.

First, we hear about Martín Chambi - Peru's pioneering documentary photographer.

Then Amaize Ojeikere talks about his father, JD 'Okhai’ Ojeikere, who created an iconic collection revealing the elaborate ways African women styled their hair.

Plus, the story of Magnum Photos – the picture agency started up by World War Two photographers.

And, Vivian Maier, the nanny who - since her death - has been hailed as one of the best street photographers of the 20th century.

Finally, the mystery behind Lunch Atop a Skyscraper – the famous photograph showing 11 ironworkers eating lunch nearly 70 storeys high.

Contributors:

Roberto Chambi – grandson of photographer Martín Chambi Dr Mirjam Brusius - research fellow in colonial and global history at the German Historical Institute Amaize Ojeikere – son of photographer JD 'Okhai’ Ojeikere Christine Roussel – Rockefeller Center archivist Jinx Rodger - widow of George Rodger, one of the founders of Magnum Photos Inge Bondi - Magnum Photos employee

This programme has been updated since the original broadcast.

(Photo: Two books of photographs in the exhibition 'Martin Chambi and his contemporaries’. Credit: Getty Images)

Max Pearson presents a collection of the week's Witness History interviews from the BBC World Service. Our guest is Dr Elizabeth Abbott, writer, historian and author of the book, "Sugar: A Bittersweet History".

First, we confront the dark history of sugar.

We hear how a researcher in the 1990s uncovered the unethical aspects of Sweden’s Vipeholm experiments in the 1940 which led to new recommendations for children to eat sweets just once a week.

And, how Mexico, a country which had one of the highest rates of fizzy drink consumption in the world, approved a tax on sugary soft drinks in 2013.

Then an event which shaped the second half of the last century - On 14 May 1955, the leader of the Soviet Union and Heads of State from seven European countries met to sign the Warsaw Pact.

Plus, the story of how two rival electricity pioneers, Nikola Tesla and Thomas Edison brought electricity to the world.

Finally, we hear from Finnish singer Marion Rung on winning the 1980 Intervision Song Contest, the USSR’s answer to Eurovision.

Contributors:

Dr Elin Bommenel - academic Dr Simon Barquera - director of health and nutrition research at The Institute for Public Health of Mexico Dr Elizabeth Abbott - writer and historian Otto Grotewohl - German politician Mark Seifer - biographer of Nikola Tesla William Terbo - relative of Nikola Tesla Marion Rung - Finnish winner of Intervision song contest 1980

(Photo: sugar cubes and fizzy drinks, Credit: Anthony Devlin/Press Association)