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  1. Life

    Duck-billed dino could slice and dice

    Ancient animal’s teeth were made of six different tissue types.

    By Erin Wayman
  2. Life

    Mouse stem cells yield viable eggs

    Japanese scientists’ technical feat might provide new insights about protecting and extending human fertility.

    By Tina Hesman Saey
  3. Life

    Black mamba bite packs potent painkiller

    Scientists find that a component of snake venom blocks pain-sensing nerve signals.

    By Tanya Lewis
  4. Animals

    Right eye required for finding Mrs. Right

    Finches flirt unwisely if they can only use their left eyes.

    By Susan Milius
  5. Chemistry

    Chemical bond shields extreme microbes from poison

    Molecular structure explains how ‘arsenic life’ bacteria instead survive by fishing out phosphate from their surroundings.