This creative non-fiction book is a good read (written by her son) about another unsung and thankfully not forgotten woman who made a difference but got no credit for for her invention of the rocket fuel that propelled the first US rocket into to space to launch our first satellite. Who knew!? Certainly not in the history books, but everyone knows the ex-Nazi Werner von Braun, also working on rocket projects. Yes, she worked among a team of 900 other men (literally the only woman) but as is described in the book when her position was up for discussion, her supervisor told his boss (who wanted to take her the project because she was a woman) that yes, he had all these other brilliant men working for him but that Mary was the best. This boss was like so many others with their egos and disbelief that a woman can be smart, indeed, smarter than the men.