BBC Four HD Today

David Attenborough looks at life in Asia, with footage of walruses gathering in huge numbers in the frozen north and brown bears roaming around remote Russian volcanoes

The cultural historian heads to the vast Konya Plain of Turkey, tracking a young explorer who found the world's oldest city

Robert Robinson presides over another duel of words and wits as Frank Muir, Prunella Gee and Humphrey Burton take on Patrick Campbell, Hannah Gordon and Bryan Marshall

Joseph Cooper invites viewers to match their musical wits against Joyce Grenfell, Brian Redhead and Alvar Lidell. With guest musician David Atherton. First broadcast in 1975

Mathematician Marcus du Sautoy demystifies the hidden world of algorithms, which have secretly taken over the modern world, running everything from search engines to satnavs

A profile of the artist, combining an interview with Kirsty Wark, behind-the scenes access and archive footage to tell the story of a true visionary of British art

James Fox tells the story of the human race's ever-changing relationship with nature through the lens of some of the world's most extraordinary artworks

David Attenborough looks at life in Asia, with footage of walruses gathering in huge numbers in the frozen north and brown bears roaming around remote Russian volcanoes

Joseph Cooper invites viewers to match their musical wits against Joyce Grenfell, Brian Redhead and Alvar Lidell. With guest musician David Atherton. First broadcast in 1975

The cultural historian heads to the vast Konya Plain of Turkey, tracking a young explorer who found the world's oldest city