Ghost Crystals is another discrepant event. Clear water absorbing spheres or polyacrylate gel crystals work. Put clear spheres or crystals in water and watch them disappear. Ask the kids to explain why they disappear. Here is an explanation. Activities like Ghost Crystals make kids think. I bought a variety of grow spheres, cubes, and spikes. Below are pix. The spikes are still visible. Use crystals or spheres instead.
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