BBC World Service - Exchanges At The Frontier

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The philosopher AC Grayling and a public audience test the world's leading scientists over the meaning of their work.

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Lisa Randall - Professor of Physics

How many dimensions did the big bang bang?

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Frances Ashcroft - Physiologist

Electrical charges in the human body - what are the implications for disease and cures?

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Jeremy Farrar - Epidemiologist

What if anything can be done to allay the risks of global epidemics?

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Lisa Randall - Professor of Physics

How many dimensions did the big bang bang?

BBC World Service

Sun 17 Feb 2013 13:05 GMT BBC World Service

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