Doris Barron with Manometer Tape, 1950s. Photo via  NASA.gov , courtesy Beverly Golemba.  TOP PHOTO:  Retired NASA-Langley mathematicians in 2014. L-R: Christine Darden, Janet Stephens, Sharon Stack. Seated: Katherine Johnson. Photo credit: NASA

Doris Barron with Manometer Tape, 1950s. Photo via NASA.gov, courtesy Beverly Golemba. TOP PHOTO: Retired NASA-Langley mathematicians in 2014. L-R: Christine Darden, Janet Stephens, Sharon Stack. Seated: Katherine Johnson. Photo credit: NASA