Description Get to know the woman who made many of NASA's early missions possible in this fascinating, nonfiction Level 3 Ready-to-Read, part of a series of biographies about people "you should meet!" Meet Katherine Johnson, a brilliant mathematician who worked at NASA in the early 1950s until retiring in 1986. Katherine's unparalleled calculations (done by hand) helped plan the trajectories for NASA's Mercury and Apollo missions (including the Apollo 11 moon landing). She is said to be one of the greatest American minds of all time. A special section at the back of the book includes extras on subjects like history and math, plus inspiring careers for math lovers.