Michael Portillo travels from the Black Forest to Hanover, via Heidelberg, the Frankfurt Stock Exchange and Goettingen University. Show more

The second round continues as two student teams make a bid to reach the quarter-final stage of the competition. Jeremy Paxman asks the questions.

Celebrating the string quartet through 50 years of BBC archive. Ensembles including the Amadeus, Chilingirian, Borodin and Kronos quartets perform in myriad styles and settings. Show more

Wildlife film. Mike Rutzen is on a quest to understand the great white shark better, taking him into the heart of their hunting grounds. Show more

Beginning at the coral reef of Ningaloo in Australia, intrepid marine biologist Mark Meekan attempts to unravel the mysterious wanderings of whale sharks. Show more

Wildlife cameraman Gordon Buchanan returns to where he grew up, the Isle of Mull, to find out what makes the island such a paradise for the magnificent white-tailed sea eagle. Show more

How thousands of strange nocturnal birds make their home on the island of Bardsey in north Wales, and an exploration of the history of the island itself. Show more

Banned from making movies in Iran, director Jafar Panahi poses as a taxi driver, driving around Tehran recording the lives of its inhabitants and the difficulties they face. Show more

Celebrating the string quartet through 50 years of BBC archive. Ensembles including the Amadeus, Chilingirian, Borodin and Kronos quartets perform in myriad styles and settings. Show more

Wildlife film. Mike Rutzen is on a quest to understand the great white shark better, taking him into the heart of their hunting grounds. Show more

Beginning at the coral reef of Ningaloo in Australia, intrepid marine biologist Mark Meekan attempts to unravel the mysterious wanderings of whale sharks. Show more