Poke a toothpick through the top of the crime scene filter paper. Rest the toothpick on the edge of an empty glass (or hold it) so the filter paper hangs down inside.
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Use chromatography to separate the pigments in leaves and see what they're made of.
Try this simple activity to change the color of a flower.
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Feel the physics and consider the chemistry of natural phenomena like tornados and avalanches.