A cross-section of skeletal muscle in this light micrograph shows the individual, parallel muscle fibers (red). These fibers work in concert to power movement. Thomas Deerinck, NCMIR/ScienceSource hide caption

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Experimental Technique Coaxes Muscles Destroyed By War To Regrow

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False-color transmission electron micrograph of a field of whooping cough bacteria, Bordetella pertussis. A. Barry Dowsett/Science Source hide caption

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Family Tree Of Pertussis Traced, Could Lead To Better Vaccine

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'Blood Victory' In Medical Research Dispute

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A minke whale photographed in Antarctica last year. The minke, smallest of the baleen whales, turned out to be the mysterious "bio-duck." Tony Beck/Barcroft Media/Barcroft Media/Landov hide caption

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Scientists Pinpoint Source Of Antarctic 'Quack'

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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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Psychological Consequences Of Calling Obesity A Disease

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Evidence Of Racial, Gender Biases Found In Faculty Mentoring

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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

toggle caption Dr. Phil Luton/Science Photo Library/Corbis

Who's Protecting Whom From Deadly Toxin?

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An artist's rendering of Kepler-186f, the first validated Earth-size planet to orbit in the habitable zone of a distant star. T. Pyle/NASA/SETI Institute/JPL-Caltech hide caption

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Scientists Spot A Planet That Looks Like 'Earth's Cousin'

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