The Constant Factor

A young man is facing death of his mother. A petty corruption at his job leads to him being framed and robbed of his only desire to climb mountains in Himalayas, as his father did and where he died.

See how little things like a stripped screw or a faulty toilet can become big emergencies when they happen in space.

Readily available and aggressively marketed online, exposure to hardcore pornography is now mainstream. No match for the parent talk, with its endlessly array of gyrating bodies, porn offers a quick, easy and anonymous sexual charge. It has become the default sexuality educator for young people growing up online. Directed and produced by Maree Crabbe, this documentary brings to focus the 21st century challenges faced by parents, schools and others as they seek to equip young people for a sexuality that is safe, respectful and fully consenting.

A look at the astounding leaps in sciences and the arts, products of the brilliant minds of the Renaissance.

Maggie Aderin-Pocock and Chris Lintott look back at some of the biggest stories featured on the programme in 2020, with the help of special guests who have chosen their favourite moments. From the launch of Solar Orbiter to the discovery of phosphine on Venus, the team relive the astronomy highlights of a highly unusual year.

They are many. They are everywhere. And they're not killers: viruses. These artists of survival, as old as life itself, are the engine of evolution - including that of humans. "Viruses are the rulers of the world, they show us where to go." - This is how the renowned virologist Karin Mölling describes viruses in the film. The documentary undertakes a fascinating journey into the virosphere: marine biologists show the role of viruses as protectors of coral reefs of the world's oceans, and researchers have only recently discovered the importance of viral colonization in our intestinal system. Viruses have cured people from severe bacterial infections in Georgia for over a hundred years.

The story of one of racing's most successful flat jockeys, Johnny Murtagh, who won virtually every big race there was to win. However, behind his rise to the top was a fierce mental battle that saw him confront alcoholism and the constant struggle to maintain the low body weight be a rider. Murtagh bares his soul on how he turned his life around conquered his demons to reach the top.

Physicist Brian Greene's bestselling book comes to the small screen in this stimulating look at a complicated topic: the search for order in the universe. Is a revolutionary proposal–"string theory"–the answer scientists have been seeking for centuries? Greene tackles the mind-boggling complexity of the theory with vivid, clear images, and calmly points the way to the answer

Physicist Brian Greene's bestselling book comes to the small screen in this stimulating look at a complicated topic: the search for order in the universe. Is a revolutionary proposal–"string theory"–the answer scientists have been seeking for centuries? Greene tackles the mind-boggling complexity of the theory with vivid, clear images, and calmly points the way to the answer.