Equal Pay Day usually marks the apex of public conversation about women’s average earnings, the persistence of gender discrimination and its life-altering effects. But most of the spotlight fades away after that day, which is the point each year when women’s earnings theoretically catch up to what men earned during the previous year. And for at least two groups of American women — black and Latina — the wage gap remains not only very real, but also too large to surmount in an average lifetime.