Zeshan Qureshi is a Pediatrician based at Great Ormond Street and the Institute of Child Health. He graduated with distinction from the university of Southampton, and has published and presented research work extensively and internationally in the fields of pharmacology and medical education. Whilst working in Edinburgh he was part of the leadership team developing a near peer teaching programme, where by junior doctors, throughout south east Scotland, were both trained to teach, and delivered teaching across every hospital in the area. This book is an extension of this philosophy: that junior doctors and fresh graduates know how to express complex ideas in order for it to be easily understood from a student's perspective. That junior doctors can teach, and write in a complimentary way to senior doctors: one that is friendly and fun, easy to read and relevant to both exams, and the day to day to life of junior doctors. Ceen-Ming Tang is a final year medical student at the University of Oxford. She graduated with an Honours BA (1st class), winning the Gibbs Prize in Medical Sciences and Wronker Prize in Pharmacology. She has presented her research internationally at Gordon Conferences, and published extensively in the fields of drug discovery and gastroenterology. Colin Fischbacher (MBChB MSc FFPH FRCP) qualified in medicine from Edinburgh University in 1979 and trained in general medicine and general practice in Glasgow. He gained an MSc in public health from the London School of Hygiene and Tropical Medicine in 1993 and spent 10 years working in public health in East Africa. Since 2004 he has been a consultant in public health medicine at the Information Services Division of NHS National Services Scotland. He is an honorary senior lecturer at the Universities of Edinburgh and London, and teaches epidemiology on MSc courses in Edinburgh, Glasgow and London. He helps to run the annual Crash Course in epidemiology at the University of Edinburgh.