Respondents: 22
Answers: Every year (17)
Every other year (5)
Every 5 years (0)
Never again (0)
Photo:
Seen here 400 times their true size, diatoms are a type of algae found in oceans, fresh water, and soil.
A blog hosted by the 2008 graduates of the Center for Integrative Medicine at the University of Arizona.
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