Women in Mathematics! Katherine Johnson calculated trajectories, parabolic and otherwise for NASA in the 1960s. Almost 70 years earlier Mary Boole invented curve stitching to teach the mathematical properties of parabolas to children. We made some really great foldable parabolas to connect to the work of both these women in math. Here’s the laser file – we cut the holes and also etched the cardstock – after you string it, you get to bend it. Stretch cord works great!