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  1. Chemistry

    Breathe better with bitter

    Taste receptors in the lungs open airways in response to acrid gases.

    By Rachel Ehrenberg
  2. Health & Medicine

    Pet frogs can transmit salmonella

    A CDC investigation adds a common aquarium species to the list of amphibians that can carry and spread bacteria.

    By Nathan Seppa
  3. Life

    Why flies can drink and drink

    Fruit flies use sophisticated pumps to suck fluids as thick as syrup.

    By Marissa Cevallos

  4. Iron in the Mix

    Scientists look for the secret behind high-temperature superconductors.

    By Gwyneth Dickey

  5. Massacre at Sacred Ridge

    A violent Pueblo incident sparks debate regarding prehistoric genocide.