 Chelsea Wald, Ivan Hermans May 2008
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 Chris Vallance May 2008
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 Ian Mercer, Gemological Association of Great Britain April 2008
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 Philip Martineau, Diamond Trading Company April 2008
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 Chris Wort, Element 6 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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 Melinda Campbell, Science Museum & Jacob Tompkins, Waterwise 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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 Sarah Heilbronner March 2008
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Dr Sarah Staniland, Edinburgh University March 2008
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 Professor Rita Colwell, University of Maryland and John Hopkins University March 2008
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 Dr Clifford Leen, Western General Hospital. March 2008
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 Dr Keith Sockman, University of North Carolina, Chapel Hill March 2008
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 Nicola Buckley, Cambridge Science Festival March 2008
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