1/5 Lindsay Duncan reads from Hilary Spurling's biography of American writer Pearl Buck.
26/30 Heather Couper looks at William Herschel's discovery of infrared radiation 200 years ago.
1/3 Egyptian writer Tarek Osman examines the history of this desert kingdom.
1/10 Anthropologist David Graeber examines the moral power that debt holds over people.
5/5 Stanley is determined to continue Livingstone's quest to find the source of the Nile.
25/30 Heather Couper looks at arguments over the laws of physics and the universe's creation.
Andrew Dilnot explores the statistics involved in enfranchisement.
What is the truth behind the mermaid story? Janet Ellis investigates.
4/5 David Livingstone aims to solve the mystery of the Nile's source once and for all.
24/30 What we can see is only a fraction of matter in the cosmos. Heather looks at dark matter.
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