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National and international news from BBC Radio 4.
Professor Iain Stewart visits Britain's leading laboratories
3/5 Prof Stewart visits Rothamsted Research, the world's oldest agricultural research centre.
2/5 Prof Iain Stewart is amazed how nano materials may revolutionise computers and solar power
4/5 Prof Iain Stewart explores stem cell technology at the CRM in Edinburgh.
Tue 12 Jul 2011 09:30 BBC Radio 4
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