Invisible Women by Caroline Criado Perez, meticulously exposes the pervasive gender data gap, revealing how a world designed around male data and perspectives disadvantages and often endangers women. The author argues that this unintentional yet systemic bias manifests in various aspects of life, from flawed safety measures and misdiagnosed health conditions to skewed urban planning and discriminatory technology. Perez demonstrates how the historical and ongoing exclusion of female data and experiences leads to policies, products, and research that fail to account for or actively harm women. Ultimately, the book calls for a fundamental shift in data collection and analysis to create a more equitable world that truly considers the needs and realities of all genders.