Whether it’s English, Spanish, Chinese, or Urdu, babies and young children are able to pick up their native language with remarkable ease; no one language seems any more difficult than any other. Yet few children who are taught a language in school have anything to show for it when they grow up. Why is learning a second or third language so difficult?

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.

Professor Brian Cox takes a global journey in search of the energy source of the future. Called nuclear fusion, it is the process that fuels the sun and every other star in the universe. Yet despite over five decades of effort, scientists have been unable to get even a single watt of fusion electricity onto the grid.

In this third Horizon special, Dr Chris Van Tulleken is joined by his brother Xand and Dr Guddi Singh to take us through the latest developments and answer current concerns.

In the past few years we have shivered through two record-breaking cold winters and parts of the country have experienced intense droughts and torrential floods. It is a pattern that appears to be playing out across the globe.

Jimmy Doherty, pig farmer, one-time scientist and poster-boy for sustainable food production is on a mission to find out if GM crops really can feed the world.

Nobel Prize winner Sir Paul Nurse examines why science appears to be under attack.

Around the world, a new generation of astronomers are hunting for the most mysterious objects in the universe. Young stars, black holes, even other forms of life.

Volcanoes have long helped shape the Earth. But what is less well known is that there are volcanoes on other planets and moons that are even more extraordinary than those on our own home planet. Horizon follows an international team of volcanologists in Iceland as they draw fascinating parallels between the volcanoes on Earth and those elsewhere in the solar system.

For decades, some have suspected that there might be others out there, intelligent beings capable of communicating with us, even visiting our world. It might sound like science fiction, but today scientists from across the globe are scouring the universe for signals from extraterrestrials.

The film also uncovers the disturbing story of how shipping noise is deafening whales and dolphins, affecting their survival in the future.

Liz Bonnin presents a Horizon special about a rare and beautiful event in our solar system, one that we should all be able to see for ourselves - the transit of Venus across the face of the sun.

Idris Elba reveals the defining moments in street music and culture over the last 35 years, featuring rare archive material, seminal music videos and insight from hip hop stars.

In episode two, the journey through bohemian history reaches the early 20th century, when the Bloomsbury Group and others were determined to challenge sexual taboos - sometimes in their work and often in their private lives. They threw off their inhibitions, and frequently their clothes, and set the tone for generations of bohemians who followed. But what did the pursuit of freedom do for these artists, their art, and the people around them?

We can survive for weeks without food, but only days without water: it is the essential element of life. Yet many millions of us live in parched deserts around the world. In the second episode of Human Planet, we discover how the eternal quest for water brings huge challenges - and ingenious solutions - in the driest places on Earth.

Grasslands feed the world. Over thousands of years, we humans have learned to grow grains on the grasslands and domesticate the creatures that live there. Our success has propelled our population to almost seven billion people.

The rainforest is home to more species of plants and animals than any other habitat on the planet. But for humans, life there is not as easy as it looks. Life in the trees requires great skill, ingenuity and sheer bravery.

A documentary chronicling the story of Stiff Records, a tiny independent that took music out of the boardroom and gave it back to the fans.Stiff\'s successes included Nick Lowe, the Damned, Elvis Costello, Ian Dury, Madness, Tracey Ullman and the Pogues.

The second of a two-part series for Imagine on the art of stand-up comedy. Alan Yentob talks to comedians in Britain and America, exploring the evolution of stand-up and how it transfers to other mediums.

One of two contrasting views on immigration under the slot title 'Unwelcome Britain?'. The other is 'Let 'em all in' Looks at the impact of immigration on social and health services, the economy and British cultural identity. Rod Liddle, takes a critical look at current immigration policy and raises concerns about problems that need addressing in order to prevent growing resentment and anger from many people in the country.

The definitive story of going to the moon, told by those who went. Between 1969 and 1972 an elite group of men achieved an incredible dream. They were, and remain, the only human beings to set foot on a planet other than our own.

Now that Hanna knows her own son is 'Inez', the police infiltrator within the Mimica crime family, she wants to get him out right away and close the investigation. Christian, however, has other ideas.

Christian is on the verge of a total breakdown after what happened to Stefan. A shocked Hanna and Bjorn decide to break the investigation off and bring Christian in, but Davor has other plans for him.

The way most Britons come into contact with the Foreign Office is when they get into trouble overseas. We follow three diplomats as they try to aid Brits who unexpectedly find themselves in serious trouble on the other side of the world.

In 1932, the Nazi party obtained more votes than any other, with forty percent of all Germans choosing to vote for Hitler as their leader. Germany was crippled by losing the First World War and as Lawrence Rees' interviews reveal, economic chaos led many to seek a strong and extreme solution to their problems

A distressed woman arrives at Vigata police station to report the disappearance of her brother. Soon enough, the man is found murdered in what appears to have been a crime of passion.

The definitive documentary record of one of Jimi Hendrixs most celebrated performances, now digitally remastered and featuring footage never seen on television before. It includes such signature songs as Purple Haze, Voodoo Child and his rendition of the Star Spangled Banner, as well as interviews with Woodstock promoter Michael Lang and Hendrix band members Mitch Mitchell, Billy Cox, Larry Lee and Juma Sultan among others.

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.

The seventh of Harvard professor Michael Sandel's famous lectures on the philosophy of justice looks at the issue of individual rights and the freedom to choose. If our place in society is determined by where we best fit, doesn't that eliminate personal choice? What if I am best suited to do one kind of work, but I want to do another?

One of two contrasting views on immigration under the slot title 'Unwelcome Britain?'. The other is 'Immigration is a Time Bomb'