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  1. Earth

    Skin proves poor portal for arsenic in treated wood

    Direct contact with old-style pressure-treated lumber should pose little risk that arsenic will penetrate the skin.

    By Janet Raloff
  2. Health & Medicine

    New cholesterol guidelines advise more treatment

    Citing results from five recent trials of anticholesterol statin drugs, U.S. health officials recommend that physicians use the drugs to treat many more patients with high cholesterol.

    By Ben Harder
  3. Paleontology

    Chipmunks in Wisconsin toughed out ice age

    Analyses of DNA from chipmunks in parts of the U.S. Midwest hint that some populations of the creatures stayed in northern refuges rather than migrating south at the beginning of the last ice age.