Daily TV & radio guide - Thursday

Secrets of the Ancients (10.00 am UK Horizons) Re-runs of the BBC Science series from last year begin with an episode in which Robin Knox-Johnston tries to sail a reconstructed Viking longship.
Crossing Continents (11.00 am R4). Romanian police corruption and Roma victimisation.
Music Restored (4.00 R3). Tudor cathedral music.
The Material World (4.30 R4). Brigid Heywood (Keele) and Paul Taylor (Warwick) on polymer technology.
Endurance: Shackleton and the Antarctic (8.00 C4). Two-hour To the Ends of the Earth special on Shackleton’s 1914-16 expedition, co-produced with PBS in the States.
A Southall Lad (8.00 R4). Jatinder Verma recalls the summer of 1976 – a murder in Southall and the birth of Britain’s anti-racist movement.
Ill Said, Ill Sung (8.20 R3). In the interval of a broadcast (from Covent Garden) of Tristan und Isolde, a collage of comments on the role of music in Samuel Beckett’s work.
In Business (8.30 R4). "Robot Wars". If future computers become as intelligent as humans, what’s left for us to do? Peter Day investigates.
Horizon: The Secret Treasures of Zeugma (9.00 BBC2). What a team of French rescue archaeologists discovered about the ancient Greco-Roman city of Zeugma on the Euphrates before it was drowned by a dam project.
Leading Edge (9.00 R4). How does the brain’s "leaky wiring" work? New research on how human brains learn.
Britain at War in Colour (10.00 ITV). Part two (of three). As well as colour footage from the time (1943), extracts from letters and diaries illuminate the wartime mood of Britain.
Open Science (from 12.30 am BBC2). Including, at 3.00 am, Stress – what it is and how it can be measured. Find out more at the Open Science website.