The full series at guardian.co.uk/scienceweekly
Presented by Alok Jha and produced by Andy Duckworth.
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Apparently cosmogenic dating is nothing like internet dating. Glad we cleared that one up.
Follow Chris' expedition on Twitter @ProfChrisTurney.
Robin McKie and Nell Boase are in the studio to discuss this year's Edge Question: What scientific concept would improve everybody's cognitive toolkit?
The founder of edge.org John Brockman tells us how they dreamed up the idea of picking the brains of the world's leading thinkers, and one of the brains, social media expert Clay Shirky, explains his answer to this year's question.
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