7gen Bloc
Posted by scienceman | Mon, Jul. 2, 2007
Scienceman, why is it that cicadas hatch only every 17 years and WHAT is their purpose?
Photo courtesy of Arthur D. Guilani
Posted by scienceman | Mon, Jul. 2, 2007
Scienceman, why is it that cicadas hatch only every 17 years and WHAT is their purpose?
Photo courtesy of Arthur D. Guilani
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