library_001_lg

Published August 18, 2009 at 288 × 241 in library_001_lg
farm soil

A teaspoon of good farm soil contains up to one billion bacteria in more than 4,000 species. (Photo © L. Clarke/Corbis)

A teaspoon of good farm soil contains up to one billion bacteria in more than 4,000 species. (Photo © L. Clarke/Corbis)

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