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)

Episoder(470)

The Challenger Disaster

The Challenger Disaster

The launch of space shuttle Challenger goes horribly wrong, Rupert Murdoch goes to war with his print unions, Australia's 18th century penal colonies, Sharia law in Nigeria, and Batman comes to TV.Photo: Christa McAuliffe (left) and Barbara Morgan. Credit: Nasa

30 Jan 201650min

Michael Jackson's Thriller

Michael Jackson's Thriller

The 1982 release of the world's best selling album; plus the untimely death of General George S Patton; the former child star Karolyn Grimes on the film It's A Wonderful Life, the Beagle 2 mission to Mars, and Vladimir Nabokov's scandalous book, Lolita.(Photo: Michael Jackson and assorted zombies in the video for Thriller in 1983. Credit: 01/01/1983 Publicity Handout)

31 Des 201545min

The Battle of Tora Bora

The Battle of Tora Bora

The hunt for Bin Laden in the mountains of Afghanistan; a Ku Klux Klan trial in 1965; the siege of Kut in World War 1; an unexpected alliance in 1980s Britain with Lesbians and Gays Support the Miners; and seminal alternative rock band the Velvet Underground's first gig.(Photo: Afghan fighters look out over a smoking valley after a US B-52 aircraft bombed a front line position in the mountains of Tora Bora in north-eastern Afghanistan. Credit: Associated Press)

12 Des 201550min

The Amman Bombings

The Amman Bombings

Suicide bombings in Amman; a massacre in East Timor that was a turning point on the road to independence; the fall of the Taliban; anti-Sikh riots in India; and the BBC's first wildlife broadcaster

14 Nov 201550min

The Death of Rock Hudson

The Death of Rock Hudson

Angie Dickinson remembers her friend, the Hollywood superstar who became the most high profile celebrity to acknowledge he was suffering from Aids; plus one of the founding members of Cuba's Buena Vista Social Club, the Danish cartoon controversy, remembering Kabul's musicians' quarter and the birth of Karaoke. Photo: Rock Hudson at the BBC.

3 Okt 201550min

Korea Divided

Korea Divided

In this programme: Korea split along the 38th parallel, child prisoners of the Japanese during World War Two, the notorious Devil's Island penal colony, the man who published Harry Potter and Sue the T-Rex skeleton.Photo: Korea 38th parallel Credit: AFP

15 Aug 201549min

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