Typically potentially-deadly threats in a home are fairly easy to recognize. Dangerous situations such as fuel stored too close to a heating source, faulty wiring, or unsafe handrails can be spotted and mitigated. But what about threats that are invisible, silent, odor and taste-free, and cannot be felt? There are such threats in the world that affect many homes and without proper testing may go undetected for decades. One of the most common of these hidden threats is the presence of radon gas within a building.