At any given time, about 800 million people around the world are menstruating. For many of them, that’s a problem. Activists and entrepreneurs are working to make sure all women have easy access to sanitary products, which is likely to affect everything from education to career opportunities, and of course, women’s overall health. We discuss with Jennifer Weiss-Wolf, a lawyer and author of “Periods Gone Public: Taking a Stand for Menstrual Equity,” Marni Sommer, an associate professor of Sociomedical Sciences at Columbia University’s Mailman School of Public Health and executive director of Grow and Know, a non-profit that develops puberty books for girls and boys in poor countries, and with New Jersey Sen. Cory Booker, who co-sponsored a bill to increase access to menstrual products for incarcerated woman.