To be honest, I’m not particularly a fan of the Rookie Ready to Learn series in general:  I find the activities in the back of each are often formulaic and only tenuously related to the story; each one ends by telling you someone’s version of what you just learned by reading this story (besides being patronizing, they often don’t hit the mark).  But if you do like this kind of thing, or you’re willing to ignore the extra features that don’t enhance them, the central stories are often good little stories, with redeeming qualities of their own.  This one is a Spanish translation of another book in the series.  In order to preserve some of the rhyme of the original, they needed to make small adjustments to the meaning, so it is not a direct translation, but it still serves the same function: to use the story of a girl’s construction of a rocket to build shape vocabulary.