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20060131 earthworm hits dirt | by schizoform
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20060131 earthworm hits dirt

used (exactly why I can't imagine) in a Mind Institute workbook on visual approaches to mathematics -- and, much more reasonably, by Treehugger, the Foundation for National Parks & Wildlife's "Backyard Buddies" and openstax Concepts of Biology

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Taken on January 31, 2006