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This book (with free Online Edition) is full of clear revision notes and diagrams for Higher Level OCR 21st Century GCSE Additional Science. It includes a section on 'Ideas About Science', loads of exam advice and revision summary questions. Everything's explained in straightforward language, with a touch of humour to keep things interesting. What's more, a free Online Edition of the whole book is included - perfect for revising on a PC, Mac or tablet device.