James Lovelock discusses his controversial theory that proposes Earth be seen as a single living organism and the consequences that this could have for its future. Show more

Sir Tim Hunt talks about his discovery of the mechanism of cell division and reveals his own opinions on the thought processes, logical and emotional, that led to it. Show more

Jacques Peretti ventures into the world of YouTube. Jacques meets the video bloggers making a living on the site, and goes behind the scenes at YouTube's European headquarters. Show more

Horizon follows three people as they undergo remarkable new cancer treatments: from a genetically targeted drug that fights a type of skin cancer to advanced robotic surgery. Show more

Kids journey into the mathematical world that underpins their favourite sport. Romario and Hayden visit the Arsenal training centre to take on a prediction challenge. Show more

Dallas Campbell delves into the Horizon archive to discover how our understanding of intelligence has transformed over the last century, from early caveman thinkers to computers. Show more

Series exploring scientific issues. Meeting the scientists who are tracking the emergence of 'superbugs' - dangerous bacteria resistant to antibiotics - around the world. Show more

Children journey into the mathematical world that underpins their favourite sport. Rugby fans meet two of the Wales national rugby team and measure their furthest pass. Show more

Kids journey into the mathematical world that underpins their favourite sport. Gymnastics fans are set a shape and symmetry challenge by national champion Daniel Purvis. Show more

Professor Dame Jocelyn Bell Burnell describes how she discovered pulsars, the by-products of supernova explosions which make all life possible. Show more