Professor Barry Smith delves into the mysteries of the mind and looks at what goes into making a decision. Plus, Professor Russell Stannard argues that we are reaching the limits of what humans can understand

Professor Barry Smith, director of the Institute of Philosophy at the University of London explores what happens inside our heads when we recognise a friend or reach for a cup of coffee.

Professor Smith has just made a series of programmes for the BBC World Service called The Mysteries of the Brain, which starts today.

So that's what the brain can do. We also look at what it can't do ...

We dial up Professor Russell Stannard, emeritus professor of physics at the Open University. He thinks humans are fast approaching the end of what it is possible for us to know and understand. Caspar Llewellyn-Smith asks him about some of the themes in his new book, The End of Discovery.

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