Hidden FiguresKatherine, Dorothy, Mary, and Christine were all good at maths. Really good. And it was their understanding of numbers that helped them do what seemed impossible. They were African American women, living during a time when being black and a woman limited what they could do. But Katherine, Dorothy, Mary, and Christine were hardworking, persistent, and most importantly, smart. That's why NASA hired them as mathematicians, also known as "coloured