TV Guide BBC Four

David Attenborough turns his attention to life in Asia, the planet's most varied and extreme continent, which stretches from the Arctic Circle to the equator. Walruses gather in huge numbers in the frozen north and brown bears roam around remote Russian volcanoes, while the deep jungle provides sanctuary for the last few Sumatran rhino. There is also a glimpse of rarely seen creatures, from yeti-like golden snub-nosed monkeys in the mountain forests of China to a bizarre predator in the baking deserts of Iran

The cultural historian heads to the vast Konya Plain of Turkey, tracking a young explorer who found the world's oldest city and rewrote the beginning of civilisation - until his reputation was destroyed by scandal

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. First broadcast in 1977

Without people noticing, modern life has been taken over. Algorithms run everything, from search engines on the internet, to satnavs and credit-card security - they even help people travel the world, find love and save lives. Here, mathematician Marcus du Sautoy demystifies this hidden world by showing some of the most essential algorithms. He reveals where these 2,000-year-old problem-solvers came from, showing how they work, what they have achieved and how they are now so advanced they can even program themselves

Bridget Riley has been challenging perception through painting for more than 60 years, with radical work that has transformed how many look at art. This documentary, featuring behind-the-scenes access and an interview with Kirsty Wark, tells the story of a true visionary of British art