Demonstrate granular convection (aka the Brazil nut effect): Avalanche - Science Snacks activity
Find order in well-mixed chaos and discover how this phenomenon relates to both science and engineering. What starts out as a cascade of well-mixed granular materials (surprisingly) sorts itself into alternating layers of salt and sand.
Full instructions for doing a version of this activity on your own are available at: http://www.exploratorium.edu/snacks/a....
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