On Wednesday, March 8, the world will observe International Women's Day. HP is stretching the day into a full week of events. Here on the HP Developers Portal, we highlight the contributions of three women who pioneered computer technology: Admiral Grace Hopper who taught a generation of military leaders about computing; Margaret Hamilton, whose software guided the Apollo space missions; and Dorothy Vaughan, a black woman in Alabama who taught herself Fortran and was portrayed in the hit movie Hidden Figures.