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  1. Health & Medicine

    Lithium increases gray matter in the brain

    Used for decades to treat manic depression, lithium may stimulate the production of new brain cells, thus raising hope that it can treat strokes, Alzheimer's disease, and other conditions that kill brain cells.

    By John Travis

  2. Psst. This fly’s ears can rival a cat’s

    The unusual eardrums of a tiny parasitic fly turn out to rival cats', owls', and people's abilities to pinpoint the origin of a sound.

    By Susan Milius
  3. Archaeology

    Massive Fishery Resurfaces in Amazon

    Native groups in an Amazonian region of Bolivia built a large-scale fishery and other earthworks at least 300 years ago, before the Spanish conquest.