Ruth Redford is a freelance editor and author based in the United Kingdom. She loves writing and researching non-fiction projects and is the author ofPeriod: The Quick Guide to Every Uterus. Jake Hill grew up in North London, but escaped to the South coast to study illustration and decided to stay by the sea, swimming (almost) every morning. Aside from his love of drawing, Jake is an avid reader, a meticulous collector of comics, a terrible, but improving pianist and a passionate player of games. Nipunie Rajapakse, M.D.,is aPediatric Infectious Diseases Physician at the Mayo Clinic Children's Center. She completed a Master of Public Health at the Harvard T.H. Chan School of Public Health and previously worked as a consultant with the World Health Organization.