When I lived in Calgary I walked 25 minutes to and from work every day. Melvyn Bragg's weekly BBC radio programme was always one of my favourite things to listen to on the way. Every show has the same format: an informal forty-minute discussion with three academics. But the quintessence of In Our Time is its diversity of topics: Avicenna to Yeats to the Aeneid to Zoroastrianism.

Over the years, Bragg and his guests have covered lots of geological subjects. The wonderful BBC keeps the archive completely open, so you can listen to any show any time. Here are the most geoscientiferous ones I can find in the archive:

• Darwin tetralogy
• Ediacara biota
• Evolution
• Fossils
• Lamarck and natural selection
• Plate tectonics

• The Cambrian period
• The Earth's origins
• The geological formation of Britain
• The KT boundary
• The Permian–Triassic boundary
• Vulcanology

Here are some others, less directly related to geoscience:

• Carbon
• Chance and design
• Chemical elements
• Climate change

• Nature
• Oceanography
• Science in the 20th century
• Time

Tomorrow's programme is on random and pseudo-randomness. Can't wait!