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  1. Encouraging signs but no woodpecker

    A birding team searching in Louisiana for the possibly extinct ivory-billed woodpecker heard a promising pattern of taps but did not see the bird or hear it calling.

    By Susan Milius
  2. Health & Medicine

    Tracking Tumors

    Researchers are trying to visualize molecular and cellular changes as a cancer responds to therapy in order to predict whether treatments are effective sooner than it's currently possible to determine.

    By Damaris Christensen

  3. Ivorybill Search

    The huge ivory-billed woodpecker has remained one of the United States’ most charismatic birds, even years after its presumed demise. In the latest effort to find the bird, a Zeiss-sponsored expedition this year sought the woodpecker in a Louisiana swamp.