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Unit 12 lessons
Fibre and the Gut Microbiome
A nutrition lecturer explains how dietary fibre feeds gut bacteria and why the variety of plant foods matters more than the total amount.
Rethinking Dietary Fats
A lecturer traces how official advice on dietary fat has shifted from fear of all fat toward a focus on quality and processing.
Unit 62 lessons
Unit 112 lessons
Ice Cores and Ancient Climate Records
A lecturer explains how ice cores preserve evidence of past climates and what they reveal about climate change.
Life Around Deep Sea Hydrothermal Vents
A lecture about the discovery of hydrothermal vents and the ecosystems that thrive without sunlight.
Unit 162 lessons
The Silk Roads: More Than a Trade Route
A lecturer explains why historians now describe the Silk Roads as a shifting network of exchanges rather than a single road.
Gutenberg and the Printing Revolution
A lecture on how Gutenberg's real achievement was combining existing techniques into a reliable production system.