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  1. Life

    Just warm enough

    Mammals may have evolved a characteristic body temperature to avoid fungal infections without burning too hot.

    By Tina Hesman Saey
  2. Life

    Wealth and ambition

    A week in fancier digs inspires rats to seek richer rewards.

    By Susan Milius
  3. Space

    Newfound planet stirs old debate

    The discoverers of a fourth body orbiting a nearby star say its origins pose a challenge to existing theory, but some disagree.

    By Ron Cowen

  4. Black Holes in the Bathtub

    Scientists observe Hawking radiation in unexpected materials.

    By Marissa Cevallos

  5. Continental Hearts

    Ancient expanses called cratons pose a geological puzzle

    By Charles Petit

  6. Genetic Dark Matter

    Searching for new sources to explain human variation.