In her groundbreaking work, *Invisible Women*, Caroline Criado Pérez exposes the pervasive and often disastrous consequences of gender bias embedded within global data. The book argues that because history, science, technology, and product design have overwhelmingly used men as the default standard, half the population—women—are systematically ignored. This 'gender data gap' is not merely an oversight; it is a root cause of systemic discrimination with profound effects on women’s lives in every facet of modern existence. Perez delves into countless case studies, revealing how this bias manifests everywhere: from medical testing and product design to the workplace algorithms and even basic infrastructure. She demonstrates that when data collection fails to account for biological differences or varied societal roles, the resulting systems are inherently flawed, leading women to pay tremendous costs in time, money, and sometimes health. The book is a powerful call to action, urging readers to recognize this invisible bias and demand more comprehensive, gender-responsive data. This landmark examination of data ethics transforms how we understand systemic inequality. By bringing together international research and compelling personal stories, *Invisible Women* illuminates the hidden ways in which a world designed for men continues to disadvantage women, making it an essential read for anyone concerned with policy, technology, or human rights.
