At my placement last week, my first graders read a story during reading about a robot that a little girl made out of junk that she had saved up and of things she gathered from the junkyard. This story related to the concept of reusing, which ties well into science for the kids as they will soon be beginning a unit about "reducing, reusing, and recycling" during science lessons. The children discovered how a little girl could use old junk to make something new and useful, as well as ways that some materials/objects can be used for different purposes.