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Read articles, including Science News stories written for ages 9-14, on the SNK website.
ARSENIC AND OLD MUD

NASA scientist Felisa Wolfe-Simon samples sediment cores from California's Lake Mono that yielded a bacterium that appears to use arsenic instead of phosphorus in its metabolism, a result that suggests the chemistry of life is more flexible than thought. Credit: © 2010 Henry Bortman

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