Summary: Melvyn Bragg grapples with the concept of imaginary numbers. Perplexing digits that underpin the majority of technology we take for granted today, from radios to computers to MRI scans; not to mention quantum mechanics. Melvyn is joined by Marcus du Sautoy, Professor of Mathematics at Oxford University; Ian Stewart, Emeritus Professor of Mathematics at the University of Warwick; and Caroline Series, Professor of Mathematics, also at the University of Warwick.
