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I've always believed that if you understood ''why'' something worked in a particular way it was very easy to remember ''how'' it worked and what you needed to do. The food we eat is no exception to this rule and ''The One Show'' resident scientist Marty Jopson has undertaken to explain how things work in the kitchen - and he covers everything from the type of knives we use through to the food of the future. Best of all, he does it in language that even a science illiterate like me can understand.