Imagine a world where a doctor—without even realizing it—prescribes a medicine that harms you; where the probability of you suffering serious injuries in a car accident is 47% higher than for half of humanity; where after a hard workday, your home labor is barely noticed and unappreciated. Familiar picture? Then you’re most likely a woman. Caroline Criado Perez exposes in this book a serious problem that directly affects women’s health and well-being: developers of various products and technologies rely on data collected about a person, where by default “a person” means “a man.” Meanwhile, women—with their specific features and needs—remain unseen. The author avoids deep debates about the nature of modern feminism, but presents undeniable facts about the lack of gender data across a wide range of fields—from politics and medical research to technology, labor relations, city planning, and media. This brilliant, award-winning book proves the need for change and makes you look at the structure of our world in a new way.