In a two-part series, Nel Hedayat meets the young rebels of the Arab spring and witnesses a new wave of violence breaking out around them. She gets caught up in rioting in Egypt and Bahrain and finds out from the people on the streets what they are living through a year after the first revolutions.

In the second of two films, Nel Hedayat meets the young rebels of the two countries which have suffered the worst violence of the Arab spring. In Libya she meets heavily-armed militias asserting their power, before travelling to the Syrian border in search of first-hand accounts of the horror unfolding beyond.

Every Saturday night in China, millions gather around their televisions to watch Interviews Before Execution, an extraordinary talk show which interviews prisoners on death row.

David Attenborough chooses his ten favourite animals that he would most like to save from extinction. From the weird to the wonderful, he picks fabulous and unusual creatures that he would like to put in his 'ark', including unexpected and little-known animals such as the olm, the solenodon and the quoll. He shows why they are so important and shares the ingenious work of biologists across the world who are helping to keep them alive

To celebrate the 60th anniversary of the UK chart, from the vaults of the BBC archive comes a selection of hits that attained the toppermost of the poppermost prize and made it to number 1 in the hit parade.

Do you remember buying your first single? Where you bought it? What it was? The thrill of playing it for the first time? What it sounded like? How it maybe changed your life? Lots of us do. Lots of us still have that single somewhere in a dusty box in the attic, along with other treasured memorabilia.

Set against the breathtaking backdrop of the Himalayas, this documentary follows the gripping adventure of six Tibetan teenagers on a climbing expedition up the 23,000 foot Lhakpa Ri, on the north side of Everest. A dangerous journey soon becomes a seemingly impossible challenge made all the more remarkable by the fact that the teenagers are blind.

Geoffrey Smith's moving film follows Henry as he travels to Kiev to help Igor operate on a young man called Marian, who without surgery has just months to live. When Henry arrives, he faces a serious challenge - Marian must be awake when his tumour is removed, and Henry must use the most basic tools, including a Black and Decker drill.

In a personal journey into a family tragedy, filmmaker Cosima Spender explores how she and her relatives have been shaped by her grandfather - the pioneering Abstract Expressionist painter, Arshile Gorky.

Over the last five years an independent record shop has closed in the UK every three days. This film is documentary portrait of one of the very last still trading - a vinyl record shop in Teesside, a cultural haven in one of the most deprived areas in the UK.

Professor Jim Al-Khalili discovers the intriguing story of how we discovered the rules that drive the universe. Energy is vital to us all, but what exactly is energy?

Professor Jim Al-Khalili investigates one of the most important concepts in the world today - information. He discovers how we harnessed the power of symbols, everything from the first alphabet to the electric telegraph through to the modern digital age.

In the midst of a turbulent post Arab-spring Middle East, Israel's threats of military strikes on Iran's nuclear facilities have raised fears of a confrontation between the two countries. This film, which has obtained exclusive access to Israeli theoretical war exercises, provides unprecedented insight into Israel's internal tensions concerning an attack between Israel and Iran which, if escalates, could have major implications for global stability.

There is a battle playing out inside your body right now. It started billions of years ago and it is still being fought in every one of us every minute of every day. It is the story of a viral infection - the battle for the cell.

This is the epic story of the stars, and how discovering their tale has transformed our own understanding of the universe.

This is the story of the most extraordinary journey in human exploration, the Voyager space mission. In 1977 two unmanned spacecraft were launched by NASA, heading for distant worlds. It would be the first time any man-made object would ever visit the farthest planets of the solar system - Jupiter, Saturn, Neptune and Uranus.

A collection of performances from the BBC archives, celebrating the sights and sounds and the ups and downs of London through the words and songs through the years .

Jools Holland embarks on a personal journey through the streets, historical landmarks, pubs, music halls and rock 'n' roll venues of London to uncover a history of the city through its songs, the people who wrote them and the Londoners who joined in the chorus.

In this one-off documentary, Space Dive tells the behind-the-scenes story of Felix Baumgartner's historic, record-breaking freefall from the edge of space to Earth.

Monterey Bay on California's coast is one of the most diverse marine ecosystems in the world, its giant kelp forest bursting with life, from microscopic plankton to visiting ocean giants. The secret key to success in such a busy microworld is balance. Steve Backshall guides us through the unique geography of the bay and introduces some of its key characters in a quest to find the one species that keeps life in the kelp forest in check.

In a revelatory look at Svalbard, the most northerly region in the series, Steve Backshall leaves no stone unturned as he unravels the secrets that lie covered in ice for most of each year. Svalbard is cold, dark and foreboding, yet it is home to the world's largest land predator and the most northerly population.

What's really going on inside your stomach? In this documentary, Michael Mosley offers up his own guts to find out. Spending the day as an exhibit at the Science Museum in London, he swallows a tiny camera and uses the latest in imaging technology to get a unique view of his innards digesting his food. He discovers pools of concentrated acid and metres of writhing tubing which is home to its own ecosystem.

The heart is the most symbolic organ of the human body. Throughout history it has been seen as the site of our emotions, the very centre of our being. But modern medicine has come to see the heart as just a pump; a brilliant pump, but nothing more. And we see ourselves as ruled by our heads and not our hearts.

Is there any way to slow or even prevent the ravages of time? Veteran presenter Johnny Ball looks back over the 45 years that Horizon - and he - have been on air to find out what science has learned about how and why we grow old.

Plastic surgeon Dr Rozina Ali leaves the operating theatre behind for the frontiers of skin science and asks if it is possible to make your skin look younger without surgery.

Following a season in which football has been rocked by allegations of racism, former Premier league defender Clarke Carlisle explores how far his profession has really progressed since the dark days of banana throwing on the terraces in this documentary.

Documentary which goes inside the secretive Traveller world - a world of long and bitter memories. Filmed over twelve years, the film chronicles a history of violent feuding between rival families, using remarkable access to document the bare-fist fights between the Quinn McDonaghs and the Joyce clans, who, though cousins, have clashed for generations.

Beautiful and intimate documentary which follows the stories of a group of characters as they live through a dramatic night.

The wild Hamadryas Baboons of Ethiopia have a friend in biologist Mat Pines, they even pick the nits from his hair. He's been studying and living with them for five years in the remote and arid Awash National Park.

Touch, sight, smell, hearing and taste - our senses link us to the outside world. Dr Kevin Fong looks back through 40 years of Horizon archives to find out what science has taught us about our tools of perception - why babies use touch more than any other sense, why our eyes are so easily tricked.