Even some euro bank notes may need a good scrubbing. Like dollar bills, these notes are made from cotton and they harbor an array of bacteria. Thomas Leuthard/The Preiser Project/Flickr hide caption

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Botulism bacteria, or Clostridium botulinum, grow in poorly preserved canned foods, especially meat and fish. The microbe's toxin could be lethal as a bioweapon. Dr. Phil Luton/Science Photo Library/Corbis hide caption

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Who's Protecting Whom From Deadly Toxin?
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In some human diseases, the wrong mix of bacteria seems to be the trouble. Getty Images hide caption

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Mix Of Gut Microbes May Play Role In Crohn's Disease
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Gut Bacteria Might Guide The Workings Of Our Minds
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He's not just getting a cold. He's building his microbiome. iStockphoto.com hide caption

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Say hello to your microbiome, Rob Stein. Our intrepid correspondent decided to get his gut bacteria analyzed. Now he's wondering if he needs to eat more garlic and onions. Morgan Walker/NPR hide caption

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Getting Your Microbes Analyzed Raises Big Privacy Issues
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We may not see them, but we need them. iStockphoto.com hide caption

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From Birth, Our Microbes Become As Personal As A Fingerprint
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The tale of the tape may be told, in part, by the microbes inside you. iStockphoto.com hide caption

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Diverse Gut Microbes, A Trim Waistline And Health Go Together
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Streptococcus bacteria, like this strain, can be found in our guts. Janice Haney Carr/CDC Public Health Image Library hide caption

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Gut Bacteria We Pick Up As Kids Stick With Us For Decades
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Fungi (cyan) surround a human hair within the skin. A study in the journal Nature shows the population of fungi on human skin is more diverse that previously thought. Alex Valm, Ph.D. hide caption

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Research Reveals Yeasty Beasts Living On Our Skin
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Yeast affects several aspects of beer including the foam, or head, that forms on the of the glass. If fermentation is too vigorous, too many of the foam-stabilizing proteins may be lost. Cate Gillon/Getty Images hide caption

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Twins in Malawi helped scientists discover a role the gut microbiome appears to play in severe malnutrition. Photograph courtesy of Tanya Yatsunenko hide caption

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Gut Microbes May Play Deadly Role In Malnutrition
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