David Glover PhD, BSc, MInstP held research and teaching posts at the Central Electricity Generating Board, the Cavendish Laboratory and the Open University before becoming a full time science education author. He has written an extensive range of international science text books and CD-ROMs for all levels of the school curriculum. Penny Glover Dip.Ed. has more than 30 years teaching experience in primary schools. For twelve years she was Head of Early Years at a large primary school in Cambridge. She is co-author, with her husband David, of a number of pupils' books, work books and readers for the early years curriculum.