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Percy Harrison (MA, D.Phil.) studied Physics at Oxford University and was awarded the Scott Prize. He has undertaken research in elementary particle physics, writing several papers. He has worked as a teacher and an A-level examiner. He is currently Head of Science at Aden College. Other interests include astronomy, electronics and light aviation Gillian Waites holds a B.Sc. (Hons) degree in Cellular Pathology and a Ph.D. in Reproductive Biochemistry, both from the University of Bristol. She has been employed as a Research Associate at the AFRC Institute of Animal Physiology and Genetics Research at Babraham, Cambridge and has also worked at the Departments of Obstetrics & Gynaecology and Biochemistry at the University of Leicester. She now lives in Rugby with her husband and two daughters.