BBC weatherman Peter Gibbs makes an emotional return to Antarctica, years after he lived and worked at the British Antarctic Survey's Halley Research Station.
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Dr Xand van Tulleken investigates performance-enhancing drugs, from athletes seeking fame to people regularly taking anabolic steroids to look good. Show more
Horizon documents an extraordinary story in particle physics, following CERN's scientists as they hunt for the elusive signals that would prove if there is a new particle. Show more
Horizon investigates the cosmic dawn, the moment one hundred million years after the big bang when the first stars were born. Show more
Jimmy Carr takes over Horizon for a one-off special to try to get to the bottom of what laughter is, why we enjoy it so much and what, if anything, it has to do with comedy. Show more
Adam Pearson presents a personal film about genetics. He and his twin brother are genetically identical and both have neurofibromatosis 1 (Nf1) - yet they are completely different. Show more
Horizon reveals how new archaeological discoveries are painting a very different picture of the first native Britons. Show more
Alice Roberts explores recent discoveries in the study of human origins, revealing the transformation that has been brought about in this field by genetics. Show more
Mathematician Dr Hannah Fry uses Dr Xand van Tulleken as her guinea pig to test whether the algorithms that dating sites use to match people actually work. Show more
The story of an extraordinary scientific adventure - the attempt to control gravity. The dream of flying cars and journeys to the stars no longer seems quite so distant. Show more
The story of how our solar system will be transformed by the ageing sun before coming to a spectacular end in about eight billion years. Show more
Michael Mosley investigates the dramatic rise in e-cigarettes and what 'vaping' really does to your health. Show more
BBC weatherman Peter Gibbs's return to Antarctica becomes something of a rescue mission as the Halley Research Station risks being cast adrift on an iceberg. Show more
Liz Bonnin investigates how and why zoos keep animals and looks at whether they need to change to keep up with modern science. Show more
Horizon investigates a new era of Alzheimer's research. New scanning and gene technology is allowing scientists to identify the disease at its earliest stages. Show more
Horizon looks at dark energy - the mysterious force that is unexpectedly causing the universe's expansion to speed up. Show more
Dr Giles Yeo investigates obesity in the UK. Many people believe that if people could just eat less, the obesity problem would be solved, but this may be harder than it sounds. Show more
The gripping story of how one Russian internet millionaire is turning to cutting-edge science to try to unlock the secret of living forever. Show more
Astronaut Tim Peake's video diary of the two years leading up to his arrival at the International Space Station in December 2015. Show more
Horizon discovers that the hunt for oceans in space is starting a new era in the search for alien life. We used to think that oceans were unique to our planet, but we were wrong. Show more