This lesson plan about density immediately caught my eye because I can remember a student teacher presenting it when I was in 6th grade. It involves dropping raisins into soda and watching them sink and pop up due to their changing density when the carbonated bubbles attach to the wrinkles in the raisins. The hook is, you don't refer to them as raisins, you call them sewer bugs. Ew! Children will be dying to know what they are looking at and why they are seeing what they are seeing. They'll be especially blown away when you reach into the soda and pull out one of the "bugs" and eat it!
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