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  1. Breaking the Speed Limit

    Studies examine physiology and technology to better foresee the ultimate edge of human performance.

    By Laura Beil

  2. Botanical Whales

    Adventures in the Tortugas reveal that seagrass fields need saving too.

    By Susan Milius
  3. Climate

    Climate might be right for a deal

    The upcoming Copenhagen negotiations will take steps toward an international, climate-stabilizing treaty.

    By Janet Raloff

  4. From fringe to electromicrobiological mainstream

    Trained as a microbiologist, Ken Nealson pursues many interdisciplinary endeavors. He was a pioneer in the field of geomicrobiology and has worked on astrobiology and microbial fuel cells. He holds posts at the University of Southern California in Los Angeles and the J.