Invisible Women: Data Bias in a World Designed for Men by Caroline Criado-Perez
Holy moly! This book was a recommendation from a colleague and I was skeptical because the premise seems so obvious, but the depth of research and statistics from Criado-Perez shocked me time and time again as I read. She explores everything from how city planning limits women's financial mobility to the impact of not having female crash-test dummies. If there was ever a convincing argument for why representation matters, this book is it.