Ice Bucket Challenge and Bulgaria's dancing bears

Ice Bucket Challenge and Bulgaria's dancing bears

A warning for Aboriginal and Torres Strait Islander listeners - this programme contains the names and voices of people who have died.

Max Pearson presents a collection of the week's Witness History episodes.

We take a look at the Ice Bucket Challenge, the viral fundraising sensation that took over the internet in 2014.

Our guest Professor Sander van der Linden breaks down the psychology behind virality and outlines the challenges facing those who conquered the algorithm.

Plus, how one man smuggled punk rock over the Berlin Wall.

Also, we meet the man who found a retirement home for Bulgaria's dancing bears.

We hear the remarkable story of Australia's Freedom Riders who campaigned against indigenous discrimination.

Finally, we relive the mountain top escape of the Yazidi's who were fleeing Islamic State Militants.

Contributors: Nancy Frates – Pete Frates mother. Sander van der Linden - Professor of Social Psychology at Cambridge University. Mark Reeder - smuggled punk rock over the Berlin Wall. Dr Amir Khalil – founded the sanctuary for dancing bears. Darce Cassidy and Gary Williams – involved in the Freedom Rides. Mirza Dinnayi - helped evacuate the Yazidi's.

(Photo: Ice Bucket Challenge. Credit:Getty Images)

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Exploring space

Exploring space

To mark the 50th anniversary of the Moon landing in July 1969, five personal accounts of landmarks in space exploration. We hear from an Apollo flight controller about the moment Neil Armstrong stepped onto the lunar surface, and from one of the astronauts who survived the Apollo 13 near disaster. Plus how Laika the dog became the first living creature in space, the pioneering woman cosmonaut Valentina Tereshkova, and Britain's attempt to put the Beagle 2 lander on Mars.PHOTO: Buzz Aldrin on the Moon in July 1969 (Getty Images)

20 Juli 201950min

Kenya's ivory inferno

Kenya's ivory inferno

Twelve tonnes of ivory was set alight by President Daniel Arap Moi in Nairobi National Park in July 1989, to highlight the threat from poaching. The ivory burn was organised by conservationists who wanted to save the world's elephants. Plus, the closure of Britain's ground-breaking Common Cold Unit; Cuba executes top military officers, the Chinese allow sales of tampons and the first modern lesbian.(Photo: Ivory tusks arranged in a pile and set alight. Credit: Andrew Holbrooke/Corbis/Getty Images)

13 Juli 201949min

Surviving Cambodia's 'Killing Fields'

Surviving Cambodia's 'Killing Fields'

Life under the Khmer Rouge in the 1970s, the Germans kidnapped by the Contras in Nicaragua in the 80s, plus how Aboriginal women took on the Australian government against nuclear waste, Anita Hill's stand against the promotion of Judge Clarence Thomas to the US Supreme Court and the birth of the Sony Walkman.(PHOTO: CHOEUNG EK, CAMBODIA - 1993/02/01: Skulls are piled up at a monument situated outside Phnom Penh to serve as a constant reminder of the genocide under the Khmer Rouge during the Pol Pot years.. (Photo by Peter Charlesworth/LightRocket via Getty Images)

6 Juli 201950min

The Stonewall riot

The Stonewall riot

The riot that inspired the modern gay rights movement; Saddam Hussein's 1980s genocidal campaign against Iraq's Kurds; notorious British serial killers, Fred and Rose West; 50 years of fighting for fat people in America; and Joseph Heller on his seminal work, Catch-22.Picture: the Stonewall Inn today (Getty Images)

29 Juni 201949min

The assassination of Medgar Evers

The assassination of Medgar Evers

An African-American civil rights hero, a Chinese online star, the tragic icon of Iran's reform movement and archive recordings of the psychoanalyst CG Jung. Plus the great violinist Yehudi Menuhin's love of yoga.Photo:Roy Wilkins and Medgar Evers Being Arrested on 1st June 1963 in Jackson, Mississippi. Credit: Getty Images

22 Juni 201950min

The first anti-psychotic drug

The first anti-psychotic drug

How a 1950s drug helped revolutionise the treatment of mental illness. Also, how hundreds of thousands of Kosovans fled when NATO bombed former Yugoslavia. Plus, a monumental public artwork in post-Cold War Berlin, Chinese-American relations after WW2, and a trailblazing same sex wedding in the 1970s.Photo: Nurses prepare a patient for electric shock treatment in a psychiatric hospital. (Hulton-Deutsch Collection/CORBIS/Getty Images)

14 Juni 201949min

D-Day

D-Day

Eyewitness accounts of the Allied invasion of Nazi occupied Europe on D-day, 6th June 1944. We also hear how the BBC reported events on that momentous day. Plus Vikings in England, the Gurkhas fight for justice and discovering the fate of 'The Little Prince'Photo: The photo titled 'The Jaws of Death' shows a landing craft disembarking US troops on Omaha beach, 6th June 1944 ( Robert Sargent / US COAST GUARD)

8 Juni 201950min

Tiananmen Square

Tiananmen Square

A student protester's perspective on the Tiananmen Square massacre, the first social network on the internet, the surprisingly controversial early years of Sesame Street, the overthrow of Emperor Bokassa in the CAR, and the death of India's first prime minister, Jawaharlal Nehru.Picture: Dan Wang speaking in Tiananmen Square (credit: Peter Turnley/Corbis/Getty Images)

1 Juni 201950min

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