Happy birthday, Evelyn Boyd Granville —she was an American mathematician who worked on the Mercury Space Program. She was the 2nd African-American woman to recieve a PH.D. in math in the USA! #hiddenfigures . . . . . . . . . #womeninscience #otd #onthisday #happybirthday #sciencehistory #blacklives #blackhistory #inspirational #shecandoit #womancrush #shero #women #science #space #math #hbd #blackwomen #cosmos #spaceexploration