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You can easily make something "demonstrative" into something investigative. For instance, I built a Solid State Tesla Coil for one of my high school science fairs. In a way it was "demonstrative" but i made it "investigative" by creating a hypothesis that I could light a fluorescent bulb without wires in x distance. Plus, you generally learn more from projects that are a tiny bit more "demonstrative" because you learn and show more information in your project.
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