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(All time pm unless stated.)

Melvyn Bragg: In Our Time (9.00 am R4). The last of the current series discusses nihilism, nothingness and Nietzsche with philosophers Rob Hopkins and Raymond Tallis.
Heritage (8.30 World Service, repeated Friday 2.30 am). The archaeology series returns with a programme about the Grand Tour.
Crossing Continents (11.00 am R4). New Jews in Germany.
Law in Action (4.00 R4).
Music Restored (4.00 R3). Music-making in Renaissance Venice.
The Material World (4.30 R4). Wave and tidal power, with Stephen Salter (Edinburgh University) and William Beattie (Queen's, Belfast) on their latest findings.
Document (8.00 R4). More delving into the past, beginning with a watch "liberated" from a U-Boat Commander.
The Great Fog (8.00 C4). A repeat of a Secret History programme about 1952's Great Fog, in London and elsewhere.
Horizon: The Valley of Life and Death (9.00 BBC2). Africa again, this time with the discovery that AIDS infection rates are lower among circumcised men, and the scientific and policy implications.
Leading Edge (9.00 R4). New attempts to split the electron.
Night Waves (9.30 R3). The changing nature of girlhood (to coincide with an exhibition at Walsall Art Gallery).
Britain at War in Colour (10.00 ITV). Part three (of three). People whose diaries and letters were used in earlier episodes look back.
Open Science (from 12.30 am BBC2). Beginning with a repeat of the Rough Science series, in which a group of scientists were given clever things to do on an uninhabited Mediterranean island.¡­ Take a look at the website.