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Take advantage of some of the Professional Learning Tools. You can select K-5 and select what kind of tools you want to use. There are free NSTA publication chapters that you should check out.
My favorite comes from the Everyday Science Mysteries. The chapters are written in short, clear narratives. In this chapter, a student planted a seedling in a jar. She weighed the jar and watched the seed grow. She hadn't added anything to the jar, but for some reason, it was gaining mass. The student decides to seal the jar just to prove that nothing has been added, but the jar continues to add mass. Why is that? (You ask your students why the jar gains mass.) You can easily bring this mystery to life with inexpensive soil, a couple of jars, and some seeds.
Another favorite is the buoyancy experiment. You need three containers (preferably narrow and tall, like a wide mason jar) three eggs, water, and sugar. You show students how an egg normally sinks in water, floats in sugar water, and then they guess what will happen with the third jar as you add sugar (and how much sugar is needed to get that egg to float.) Our experiment actually didn't go according to plan. In the jar that was supposed to have the floating egg, we didn't add enough sugar, and the egg actually half-floated. It was very cool, and all the kids were excited.
Make sure to have kids describe what they think is happening, investigate, and then try to explain in their own words what is happening. That's incorporating science learning - rather than just having cool demonstrations.
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