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  1. 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
  2. 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.

    By Ron Cowen
  3. Materials Science

    Pliable carbon

    The layers of carbon atoms that form graphite can be assembled into strong but flexible "graphene paper."