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From the King's Library of the Royal Palace in Stockholm, Zeinab Badawi talks to some of the Nobel prize-winners about the challenges for science in the 21st Century.

The role of science in public policy, and the incredible path of revolutionary discoveries.

Guests include:

• Saul Perlmutter (Physics)
• Brian Schmidt (Physics)
• Adam Riess (Physics)
• Dan Schechtman (Chemistry)
• Jules Hoffmann (Medicine)
• Bruce Beutler (Medicine)
• Thomas Sargent (Economic Sciences)
• Christopher Sims (Economic Sciences)