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  1. Health & Medicine

    Long-life Link: Gut protein ties low insulin to longevity

    A new link between insulin and aging adds to scientists' understanding of longevity and points to possible targets for life-extending therapies.

    By Patrick Barry
  2. Animals

    Finch Concerts: Female bird brain notes male attention

    Male zebra finches sing slightly differently when serenading a female as opposed to twittering to themselves, and females react to those differences.

    By Susan Milius
  3. Animals

    Love Code: A twist of light only mantis shrimp can see

    Alone in the animal kingdom, these crustaceans signal their presence to potential mates with circularly polarized light.

    By Davide Castelvecchi
  4. Health & Medicine

    Bad Blood? Old units might be substandard

    Heart patients who get transfusions of donated blood that's kept more than 14 days fare worse than patients who get fresher blood.