1. radon oslo
    samual samual United States says:
    December 8, 2010 at 5:16 AM

    Radon is an odorless gas which is produced by the normal decay of uranium in rocks and soil. And it is estimated that 1 in 15 American homes contains dangerous levels of radon. Radon can enter homes through cracks in floors, walls, or foundations, and collect indoors. It can also be released from building materials, or from water obtained from wells that contain radon.

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