I actually got to teach the sand lab one last time last week! One of the teachers in my former school wanted to give it a try, so I took all of the Atlantic samples from the cellar and brought them in. The results can be seen at http://www.gatesscience.info/project/sand/sandlab.htm
They did a great job! We'll be finishing the lab on Monday. Other breaking news . . . the west coast is complete! Someone sent me a sample from Oregon.
Clear Skies,
Charlie
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