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Meridian Music: Verdi (9.05 am, repeated Thursday 1.05am). Second of two programmes with Michael Oliver.
Memories Are Made of These (11.00 am R4). Ian Peacock investigates how memories are formed in the brain. (First of a new series).
Stephen Hawking's Universe (2.00, also 5.00, 8.00 BBC Knowledge). Repeat series from 1997 reaches episode five, which concentrates on "dark matter".
The Year 1901 (3.45 R4). Part three: Upward Mobility.
Thinking Allowed (4.00 R4). Laurie Taylor and guests.
The Disease Detectives (9.00 R4). Second in series about epidemiology focuses on Sir Richard Doll, largely responsible for discovering the link between smoking and lung cancer.