Hello,
I am interested in ordering a Benham's Disk toy top for my science fair
project on optical illusions and Benham's Disk.
Your web page http://www.exploratorium.edu/snacks/benhams_disk.html states
that the exploratorium strore has a selection of these tops, but I was unable
to find them on the Store web pages. Any help you could forward would be
great.
thank you,
Grant Jasmin
c/o eajasmin@aol.com
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