The open arenas of grassland and desert make up half of all land on our planet. In these exposed habitats, predators like cheetahs, bald eagles and lions can usually see their prey. But it works both ways: their prey can see them too. Hq Version

The coast is the dynamic border between land and sea; powered by the tides and thrashed by waves, this is a world of continuous change. Opportunities never last long here, so hunters are always in a race against time. Hq Version

The final episode of the series visits the frontline of the conflict with the world's top predators, meeting the scientists fighting to save them. Hq Version.

Taking an intimate and detailed look at the remarkable strategies employed by hunters to catch their prey and the hunted to escape. Sir David Attenborough narrates.This is a Higher Quality version.

A sharp, witty, mind-expanding and exuberant foray into the world of logic with computer scientist Professor Dave Cliff. Following in the footsteps of the award-winning 'The Joy of Stats' and its sequel, 'Tails You Win - The Science of Chance', this film takes viewers on a new rollercoaster ride through philosophy, maths, science and technology- all of which, under the bonnet, run on logic.

Documentary which takes viewers on a rollercoaster ride through the wonderful world of statistics to explore the remarkable power thay have to change our understanding of the world

Professor Richard Fortey delves into the fascinating and normally hidden kingdom of fungi. From their spectacular birth, through their secretive underground life to their final explosive death, Richard reveals a remarkable world that few of us understand or even realise exists - yet all life on Earth depends on it.

Around the world, obesity levels are rising. More people are now overweight than undernourished. Two thirds of British adults are overweight and one in four of us is classified as obese.

Jacques Peretti investigates how the concept of 'supersizing' changed our eating habits forever. How did we - once a nation of moderate eaters - start to want more?

Jacques Peretti examines assumptions about what is and is not healthy. He also looks at how product marketing can seduce consumers into buying supposed 'healthy foods' such as muesli and juices, both of which can be high in sugar.

The programme asks whether the introduction of the contraceptive pill was a blessing or burden for women in the 1960s

It was 1952, and polio gripped the world in fear. There was no known cause, no cure and no help in sight for parents desperate to protect their children. Across the ocean, eager to beat the potentially fatal condition, polio-afflicted President Roosevelt inspired the American public to send in their dimes to fund research.

In the 2012 Richard Dimbleby Lecture, leading geneticist and Nobel laureate Sir Paul Nurse explores the wonder of science and how it enhances our culture and civilisation.

In the 2013 Richard Dimbleby Lecture, one of the world's greatest entrepreneurs and leading philanthropists, Bill Gates, explains his optimism for a world free of the debilitating disease, polio. He explains why he is devoting so much of his time, money and influence to eradicating polio, and how we can all help to finish the job.

Martha Lane Fox, founder of lastminute.com, digital pioneer, baroness and chancellor of the Open University, delivers this year's Richard Dimbleby Lecture. She will challenge us all - leaders, legislators, and users - to understand the internet more deeply and to be curious and critical in our digital lives in order to tackle the most complex issues facing our society.

Drawing on the latest theories as well as 200 years of scientific discoveries and the genius of Einstein, Brian tries to answer the classic questions raised by the Doctor - can you really travel in time? Does extra-terrestrial life exist in our galaxy? And how do you build something as fantastical as the TARDIS?

Chaos theory has a bad name, conjuring up images of unpredictable weather, economic crashes and science gone wrong. But there is a fascinating and hidden side to Chaos, one that scientists are only now beginning to understand.

Science writer Dr Gabrielle Walker has been obsessed with ice ever since she first set foot on Arctic sea ice. In this programme she searches out some of the secrets hidden deep within the ice crystal to try to discover how something so ephemeral has the

90 million miles away from us is the power that shapes our world - the sun. We see it shine in the sky above us, but beyond our sight something dramatic is happening - the sun is going into overdrive.

Documentary-maker David Malone delves into the secrets of ocean waves. In an elegant and original film he finds that waves are not made of water, that some waves travel sideways and that the sound of the ocean comes not from water but from bubbles.

Professor of physics Jim Al-Khalili investigates the most accurate and yet perplexing scientific theory ever - quantum physics.

Jim Al-Khalili investigates whether quantum physics might solve mysteries in biology.

After showing how fundamental mathematics is to our lives, Marcus du Sautoy explores the mathematics of ancient Egypt, Mesopotamia and Greece.

After showing how fundamental mathematics is to our lives, Marcus du Sautoy explores the mathematics of ancient Egypt, Mesopotamia and Greece.

A look at the rise of mathematics in the East, as the West entered the Dark Ages.

How Europe took over as the world's mathematical powerhouse by the 17th century.

He concludes his journey by considering the great unsolved problems of mathematics today, including the Riemann Hypothesis, a conjecture about the distribution of prime numbers. A million dollar prize and a place in the history books await anyone who can prove Riemann's theorem.

Michael Mosley embarks on an informative and ambitious journey exploring how the evolution of scientific understanding is intimately interwoven with society's historical path.

Michael Mosley embarks on an informative and ambitious journey exploring how the evolution of scientific understanding is intimately interwoven with society's historical path.

Michael Mosley takes an informative and ambitious journey exploring how the evolution of scientific understanding is intimately interwoven with society's historical path.