NASA’s Real ‘Invisible Numbers’. Research write-up: Facts about the ladies highlighted in “concealed data.” NASA’s Real ‘Invisible Numbers’. Research write-up: Facts about the ladies highlighted in “concealed data.” In the 1960s, Mercury astronauts Alan Shepard, Gus Grissom, ... November 16, 2022 Yalda Comments Off on NASA’s Real ‘Invisible Numbers’. Research write-up: Facts about the ladies highlighted in “concealed data.”