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  1. Gassing Up: Oxygen’s rise may have promoted complex life

    The increasing amount of oxygen in Earth's atmosphere may have driven the emergence of complex life.

    By John Travis
  2. Health & Medicine

    Early Warning? Inflammatory protein is tied to colon cancer risk

    C-reactive protein, an inflammatory protein linked to heart disease, might also signal susceptibility to colon cancer.

    By Nathan Seppa
  3. Humans

    Letters from the Feb. 7, 2004, issue of Science News.

    Warm topic I was fascinated by the article on heat production in flowers (“Warm-Blooded Plants?” SN: 12/13/03, p. 379: Warm-Blooded Plants?). It speculated on the evolutionary origins of such thermogenesis and observed how it predominates in ancient lineages of flowering plants like magnolias and water lilies.