During World War II, thousands of scientists and engineers worked on the Manhattan project, the top secret push to develop an atomic bomb that would end the war. Two bombs dropped on Hiroshima and Nagasaki did just that, while also killing hundreds of thousands of Japanese civilians. The devastating potential of nuclear weapons sparked a moral controversy that continues to this day.

Hundreds of the scientists who worked on the Manhattan Project were women. Over the next few weeks we’ll be bringing you a few of their stories.