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This slice can help sequester carbon. The x-ray microtomography image shows a slice of biofilm grown on a porous hollow fiber (500 microns in diameter). By working with the chemical and physical interactions of biofilms, we can gain insight into how microorganisms can help sequester carbon, reducing environmental impact. This photo was submitted to Pacific Northwest National Lab's 2012 Science as Art Contest by Mathew Thomas and the Systems Toxicology Group. Receiving the most likes on Facebook, this photo won the People's Choice award and will appear in the Lab's 2013 Calendar.