Award-winning campaigner and writer Caroline Criado-Perez shows us how, in a world largely built for and by men, we are systematically ignoring half the population. Her new book, Invisible Women: Exposing Data Bias in a World Designed for Men exposes the gender data gap – a gap in our knowledge that is at the root of perpetual, systemic discrimination against women and that has created a pervasive but invisible bias with a profound effect on women’s lives.