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How about wet fine sand?  It can easily be "erased" for reuse.

__________________________________
Anna Grace
Exhibit Coordinator

Explorit Science Center
2801 2nd Street (Main Public Site)
3141 5th Street (Mace Park Branch)
P.O. Box 1288 (mail address)
Davis, CA 95617
530.756.0191
fax 530.756.1227
http://www.explorit.org

We've expanded!  Explorit's public exhibit gallery has moved to our  
new site along I-80 which opened on September 23 at 2801 2nd St..   
Learn more about our Expanding the Explorit Experience project and on- 
going capital campaign by visiting http://www.explorit.org/expansion/ 
index.html




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