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Discover why the sky is blue and the sunset is red.
Turn an old CD into a spectroscope to analyze light.
Prove to yourself that Galileo was right.
Just spew it—build your own cyclic hot water fountain.
Why is the sky blue? That's a sticky question.
Watch the rise and fall of hot and cold fluids.
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
Attribution: Exploratorium Teacher Institute
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