Happy birthday, Katherine Johnson, who is 99 today! She a @NASA mathematician whose calculations influenced spaceflight programs for more than three decades. . . . . . . . . #womeninspace #hiddenfigures #NASA #womeninscience #blackwomen #blackhistory #blacklives #women #space #math #birthday #happybirthday #hbd #borntoday #blackgirlmagic #womeninsSTEM #inspiring #hero #sciencehero #nationalwomensequalityday