Imagine a world where a doctor, unknowingly, prescribes a drug that is harmful to you; where you are 47% more likely to be seriously injured in a car accident than the other half of humanity; where your homework after a busy day is noticed and appreciated by few people. Is this a familiar picture? So, you're probably a woman. In her book, Caroline Criado Perez reveals a serious problem that directly affects the health and well-being of women: the developers of various products and technologies rely on data collected about a person, where "person" by default is "man." Women with their characteristics and needs remain unnoticed. The author avoids deep debates about the nature of modern feminism, but presents the undeniable evidence of gender data deficits in areas ranging from politics and medical research to technology, labor relations, urban planning and media. This brilliant book, which has won many prestigious awards, makes the case for the need changes and makes us look at the structure of our world in a new way.