US official says bird flu limits not 'censorship'

Leading US health official Anthony Fauci on Wednesday rejected claims that the United States is censoring science by seeking to limit potentially dangerous bird flu information in major journals.

Tree-killing pathogen traced back to California

Genetic detective work by an international group of researchers may have solved a decades-long mystery of the source of a devastating tree-killing fungus that has hit six of the world's seven continents.

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