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  1. Earth

    Beware summer radon-test results

    Measuring household radon levels in summer may give misleadingly low results.

    By Janet Raloff

  2. 19867

    Based on the Environmental Protection Agency’s Web resources on radon, I find that the decreases in radon levels in the summer are unlikely to be caused by a lack of air currents from less temperature differential in houses. The EPA states that an open window can be effective in reducing radon levels. And when are […]

    By Science News
  3. Astronomy

    Veiled black holes

    Many X ray sources in the sky could be active galactic nuclei smothered by gas and dust that blocks their emission of visible and ultraviolet light.