Criado-Perez dedicates a book to spelling out the many ways in which women have been left out of consideration in health issues and medicine, education, product design, policy, and virtually any other area of individual interest you might imagine. For anyone interested in building a world that works for everyone, any chapter of this book could be a possible candidate for a place to start. For example, she points out a few ways in which first phase testing in medicine have historically only used men, or a negligible number of women in tests, leading to results that show results that do not adequately represent effects on women.