In the early 1990s, two physicists, Ruth Howes and Caroline Herzenberg, began looking into a question that had aroused their curiosity: Just who were the female scientists who worked on the Manhattan Project?

Nearly ten years and hundreds of interviews later, they documented hundreds of women across a broad spectrum of scientific fields — physics, chemistry, biology, mathematics — who played crucial roles in the top-secret race to build a nuclear weapon that would end World War II.

Since the film Oppenheimer came out earlier this summer, Their Day in the Sun: Women of the Manhattan Project has enjoyed a revival of sorts as new attention is paid to the women for whom recognition is long overdue.