It’s a well-known fact that women live longer than men. But less well known is the fact that women live a larger percentage of their lives in poor health than men do. In Century Lives: The 51%, we explore the failures that have contributed to women’s health disadvantage for centuries: shortcomings in healthcare, research, education, policy, and social norms alike. And we tell the stories of the visionary leaders, doctors, and innovators working to level the playing field today.