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Life & Evolution

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dog

DOGGING IT  Some dogs in southern China carry flu viruses originally transmitted from pigs. The viruses probably spread most easily where animals are crowded, such as shelters, farms and markets.

SOCIAL EPIDEMIC  In a new Smithsonian exhibit, activist signs and buttons from the AIDS epidemic highlight some of the social consequences of infectious disease outbreaks.

tetrapod illustration

SALTY SCENE  The planet’s earliest four-footed vertebrates called tetrapods (illustrated) lived in the brackish waters of an estuary or delta, new research suggests.

Life & Evolution

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