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The Keystone XL pipeline, an $8 billion project that has attracted significant protest from environmental groups, has cleared a major regulatory hurdle on its path to completion. On Monday, the Nebraska Public Service Commission certified the pipeline to run through the state.

Spit Test May Help Reveal Concussion Severity

Nov 20, 2017

A little spit may help predict whether a child's concussion symptoms will subside in days or persist for weeks.

A test that measures fragments of genetic material in saliva was nearly 90 percent accurate in identifying children and adolescents whose symptoms persisted for at least a month, according to a study published Monday in JAMA Pediatrics.

That's in contrast to a concussion survey commonly used by doctors that was right less than 70 percent of the time.

If Houston's record deluge during Hurricane Harvey highlighted the dangers of unchecked, sprawling development, then Tulsa — another city built on oil — is a showcase for the opposite.

The Western U.S. is just starting to recover after a prolonged, 16-year drought. A lack of water can force people to take a hard look at how they use it, and make big changes. That's what happened in southern Colorado, where farmers have tried a bold experiment: They're taxing themselves to boost conservation.

Colorado's San Luis Valley is a desperately dry stretch of land, about the same size as New Jersey.

The tiny nation of Denmark has just three stations for monitoring atmospheric radiation. Each week, scientists change out air filters in the detectors and take the used ones to a technical university near Copenhagen.

There, Sven Poul Nielsen and other researchers analyze the filters. They often snag small amounts of naturally occurring radioactivity, radon for example.

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