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  1. Chemistry

    Presto, Change-o: New solutions could clean up chemistry

    Scientists have developed a simple technique to switch an oil-like solvent into a waterlike one.

    By Aimee Cunningham
  2. Earth

    Seafloor features steered tsunamis

    Tsunamis circled the globe after a magnitude 9.3 earthquake struck the Indian Ocean last Dec. 26, but the waves didn't spread evenly.

    By Sid Perkins
  3. Health & Medicine

    Dark Side of a Blood Builder: Hormone linked to diabetic blindness

    Erythropoietin, a hormone that orchestrates growth processes, may contribute to eye damage in people with diabetic retinopathy.

    By Nathan Seppa
  4. Anthropology

    A Seasoned Ancient State: Chinese site adds salt to civilization’s rise

    Analyses of remains from an ancient Chinese site situated along a river indicate that salt making occurred there as long as 4,000 years ago.