How a former prisoner in Iran fought to free her friends, a 200-year-old Antarctic mystery, eradicating small pox, the first mobile phone and rebel nuns in the US.

PHOTO: Sarah Shourd in 2010 (Getty Images)

In October 1991, an international protocol to protect the world’s last wilderness, Antarctica, from commercial exploitation was agreed at a summit in Madrid. Louise Hidalgo talks to one of the environmentalists who led a successful campaign to protect the ice continent. Also, how meditation changes the brain, the Iraqi "supergun affair", and political art in Nigeria.

Picture: Blue icebergs in Antarctica (Credit: Getty Images)

A look back at some of the most influential books of modern times, including an interview with the publisher who first spotted Harry Potter's potential. Plus, Chairman Mao's Little Red Book, Erica Jong's Fear of Flying, Brazilian bestseller Diary of a Favela, and dating handbook The Rules.

Picture: JK Rowling signs copies of the final Harry Potter book "Harry Potter And The Deathly Hallows" at the Natural History Museum in London, 2007. (Justin Goff\UK Press via Getty Images)

The prejudice faced by London's first black policeman, how a new sign language emerged in 1980s Nicaragua, the Native American casino boom, plus the release of Nelson Mandela and China's much maligned 19th-century dowager empress.

Photo: London's first black policeman PC Norwell Roberts beginning his training with colleagues at Hendon Police College, London, 5th April 1967. (Hulton Archive/Getty Images)

The hurried signing of the Treaty of Rome in 1957 which led to greater European unity, plus 1992 - when the British royal family started to reform its role after a year of scandal and disaster. Also on the programme, the horrific gang rape which prompted India to rethink its laws, the storm that helped British tree experts make an important scientific discovery and the woman born to slaves who became the first self-made female millionaire.

Photo: European leaders at the Palazzo dei Conservatori in Rome. Credit: Keystone/Getty Images

This week we're looking at extinction. The deadly fungus that's killing amphibians, the story of the Dodo, plus why discovering that whales 'sing' helped to save them. Also, the book that changed attitudes to the environment and the 'Frozen Zoo' that aims to preserve endangered DNA for future generations.

(Photo: dead frog infected with Chytrid Fungus. Credit: Forrest Brem)

The fall of East Germany's secret police; racism, injustice and a child execution in the US, plus the killing of Osama Bin Laden; the woman who negotiated peace in the Philippines, and the man who saved British aristocrats' country houses.

Photo Photo:East Germans streaming into the secret police headquarters in Berlin on the night of January 15th 1990. Credit: Zöllner/ullstein bild/Getty Images.

In 2009, Uruguay became the first country in the world to give a laptop computer to every child in state primary schools. We hear from the man whose initiative is credited with transforming the lives of students and teachers. Plus, a US soldier's account of the battle for the Iraqi city of Fallujah in 2004, and memories of the Brazilian rubber-tapper and environmentalist Chico Mendes.

PHOTO: Two Uruguayan children enjoying their laptops (Courtesy Plan Ceibal)

In 1972 a book which outlined the possible future of the world became a best-seller. 'The Limits to Growth' was based on computer modelling which suggested that if economic growth remained unfettered, there'd be a 'traumatic' decline in civilisation from 2020. It also suggested global policy changes which could prevent a downward trend. Find out which path the world took and why...

Plus, why East German punks were targeted by the secret police in the 1980s, a top UN negotiator remembers how peace was won in El Salvador in 1991, the first black sitcom in Britain and the launch of the Chippendales - the first male strip show for women - in 1979.

Photo: Front cover of 'The Limits to Growth' published in 1972.

On 24th December 1979 Soviet troops poured into Afghanistan in support of an anti-government coup. The Soviet occupation would last for nine years.

Plus, the hidden history of the board game Monopoly, the invention of chemotherapy, the heaviest aerial bombardment of the Vietnam war at Christmas 1972, and the street-performer origins of the global circus phenomenon Cirque du Soleil.

Picture: Russian tanks take up positions in front of the Darulaman (Abode of Peace) Palace in Kabul, January 1980. (Henri Bureau/Corbis/VCG via Getty Images)