 Chelsea Wald, Ivan Hermans May 2008
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 Chris Vallance May 2008
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 Philip Martineau, Diamond Trading Company April 2008
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 Dr Karl Kruszelnicki April 2008
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 Elaine Ball, Baxi group April 2008
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 Asif Din, Zedfactory April 2008
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 Dr Pamela Gay, Southern Illinois University April 2008
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 Stuart Clark and Chris Davis April 2008
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 Professor Terry Sloan April 2008
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 Chris Vallance April 2008
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 Pi the Robot, Amy & Henry, Science Festival Communicators April 2008
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Dr Sarah Staniland, Edinburgh University March 2008
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 Duncan Law-Green, Leicester University & Will Whitehall, Virgin Galactic March 2008
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 Rick Fienberg, Sky and Telescope Magazine March 2008
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 Professor David Howard, University of York February 2008
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 Professor Daniel Levitin, McGill University February 2008
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 Kate Smith-Miles, Deakin University in Australia February 2008
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 Simon Colton, Michel Valstar and Maja Pantic February 2008
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 Graham Henley from Getdata.com February 2008
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 Gordon Clarke from NPL and Dave Taylor from Imperial College February 2008
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