This article is co-published with ProPublica, a nonprofit newsroom that investigates abuses of power. About 5 billion years ago, stars merged and exploded, creating uranium that eventually became ...

This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated. You can’t see it or smell it. Radon is a ...

Hydraulic fracturing, or fracking, may cause an increase of radon gas in nearby homes. Studies on fracking and radon have produced conflicting results, leading to calls for more research. Austin ...

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