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What do 9 to 16 year-olds think a theory is? And if they don鈥檛 know, can they begin to understand science? These and other fundamental questions ore discussed in minutely researched detail by Rosalind Driver, John Leach, Robin Millar and Phil Scott in Young People鈥檚 Images of Science (Open University Press, 拢12.99, ISBN 0 335 19381 1). It鈥檚 an academic text, heavy with annotations; essential for curriculum planners. It seems we should be teaching concepts before cramming facts.