06:05 - 06:35
Mike Wooldridge considers the Sufi tradition - its history, beliefs and practices.
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Charlotte Smith asks why buying British food is such a minefield.
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Matt Baker finds how the River Clyde is being prevented from flooding Glasgow.
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Sustainable agriculture is better for the environment, but will it feed the world?
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Geoff Watts looks back on the 150 years since Darwin's Origin of Species was published.
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The scientific impact of 'Climategate'; deep Ocean survey; drilling earthquake zones.
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