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Page last updated at 11:01 GMT, Thursday, 9 September 2010 12:01 UK

'M-theory is theory of everything'

Professor Stephen Hawking speaks to science editor Susan Watts about why he believes M-theory is the elusive "theory of everything" - or the explanation of how the universe works.

He also talks about the survival of the human race, the role of God in scientific theory, research funding and death.

Read more: Are we closer to a 'theory of everything'?

This is an extended version of an interview broadcast on Wednesday 8 September 2010.

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