World War II's labor shortage cracked open a door segregation had kept shut

Shetterly opens by explaining how the wartime demand for aeronautical research at Langley in the early 1940s created an urgent need for mathematicians to perform complex calculations by hand, a labor shortage severe enough that NASA's precursor agency, NACA, began recruiting Black women with math degrees for a segregated "West Computing" unit — a hire it would never have considered under normal peacetime pressures. The need for talent, however grudgingly extended, briefly outweighed the era's usual racial exclusions.

This opening establishes the book's central tension: opportunity for these women arrived not through a change of heart about race, but through the sheer practical demands of national necessity, layered immediately with segregated facilities, lower pay scales, and separate workspaces even as their calculations sat alongside those of their white counterparts. Shetterly frames wartime pragmatism as an imperfect but real crack in a wall that would otherwise have stayed closed indefinitely.

Takeaway: necessity has sometimes forced open doors that principle alone couldn't budge.