Wolves were reintroduced into Yellowstone National Park in 1995. It was the start of one of the most famous and controversial wildlife restoration projects in the United States. Beginning in the late 19th century wolves had been subjected to a mass extermination programme as ranchers feared the wolf was a threat to their livestock. By the mid 20th century, wolves had effectively been wiped out across the country except for a few isolated pockets in the far north. But the loss of this key predator had a profound impact on the ecosystem. Alex Last has been speaking to Doug Smith, Senior Biologist at Yellowstone National Park, and Wolf Project Leader about the return of the wolf.
Photo:.A Yellowstone wolf watches biologists after being tranquilized and fitted with a radio collar during wolf collaring operations in Yellowstone National Park (William Campbell/Sygma via Getty Images)
I helped liberate Paris from the Nazis
On August 25 1944 General Charles De Gaulle, who had been in exile in London for the majority of World War 2, finally entered Paris at the head of the Free French forces. But the French capital was far from secure. Ashley Byrne hears from Charles Pegulu de Rovin, who as an 18-year-old student fought with other resistance fighters against the Nazis in the final battle for Paris.
(Photo by Pierre Jahan/Roger Viollet via Getty Images)
Finding El Salvador's missing children
At the end of El Salvador's civil war human rights investigators began the search for hundreds of children reportedly kidnapped by the army during anti-guerrilla operations. In early 1994, two years after the end of the conflict, the first six children were located in an orphanage in the capital San Salvador. Among them was Maria Elsy Dubon, who had been seized by soldiers who killed her father in May 1982. Mike Lanchin has been hearing about Maria Elsy's distressing ordeal and about the difficult reunion she later had with her biological family, who believed that she was dead.
(Photo: Peasants who lost their children during military operations in the civil war at a rally in March 2006 (YURI CORTEZ/AFP/Getty Images)
The first human Cyborg
In 1998, a transponder or silicon chip was surgically implanted into the forearm of a British scientist. It sent identifying signals to a central computer that tracked his movements and allowed him access to his workplace, by opening doors and switching on lights. Professor Kevin Warwick has been speaking to Farhana Haider about becoming a more enhanced version of himself and as a result the world's first Cyborg: a man-machine hybrid.
Photo: Professor Kevin Warwick with chip transponder Credit: Science Photo Library
Dr Seuss: the man who taught America to read
The Dr Seuss books revolutionised the way American children learnt to read in the 1950s. Books like 'The Cat in the Hat' were designed to help young children enjoy reading simple words and sentences using rhymes, anarchic characters and lively illustrations. Claire Bowes spoke to Christopher Cerf who knew Theodor Geisel, the author of the books.
Photo: Author and illustrator Ted Geisel sits at his drafting table with a copy of his book, 'The Cat in the Hat' in 1957. (Gene Lester/Getty Images)