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  1. Estrogen Shock: Mollusk gene rewrites history of sex hormone

    Estrogen and similar hormones evolved much earlier than thought.

    By John Travis
  2. Tech

    Dream Machines from Beans: Legume proteins provide motion

    Plant proteins swell and shrink in response to calcium, sparking new ideas for micromachines.

    By Kate Ramsayer
  3. Health & Medicine

    Early Warning? Spinal fluid may signal Alzheimer’s presence

    Spinal-fluid concentrations of two compounds already linked to the disease may reveal whether a person has Alzheimer's disease.

    By Nathan Seppa
  4. Paleontology

    Ratzilla: Extinct rodent was big, really big

    Scientists who've analyzed the fossilized remains of an extinct South American rodent say that the creatures grew to weigh a whopping 700 kilograms.