Katherine Johnson, whose 100th birthday we celebrate today, initially worked as a teacher, until the space race called her to a new adventure. Her calculations at @nasa influenced spaceflight programs for more than three decades. . . . . . . . . . #womeninscience #womeninstem #nasa #space #spaceflight #math #hiddenfigures #happybirthday #birthday #otd #onthisday #today #science #inspire #hero #sciencehero