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A gunman opened fire near Ottawa's National War Memorial in Ottawa on Wednesday. Shots also were fired on Parliament Hill. Two people are dead and police say they are looking for one or more suspect.

The DNA in this ancient Siberian leg bone shows that the man had Neanderthal ancestors — yet more proof that humans and Neanderthals interbred. And he lived much farther north than expected.

The number of tuberculosis cases is far higher than previously thought. And Ebola is making some patients stay away from hospitals. Yet the mortality rate is dropping.

Two entrepreneurs have developed new tricks to make food that's literally illuminating, using ingredients that are as natural and unprocessed as possible. It's just basic food chemistry, folks.

An NPR poll finds a majority of Americans are worried about Ebola. Fifty-six percent of people are either "very concerned" or "somewhat concerned" about the spread of the Ebola virus to the U.S.

The dearth of water in this state is showing no signs of easing. Officials have introduced plans to revamp the water rationing and distribution systems until the rains come. If they ever come.

Scientists first figured the claw-tipped, giant arm bones found in 1965 belonged to an ostrichlike dinosaur. But its recently recovered skull looks more like a dino designed by a committee — of kids.

Before the smartphone, the laptop and the pocket calculator, there was a powerful mechanical computer. Our new series, Tools of the Trade, begins with a look at the slide rule.

Almost 8 million vehicles are now being recalled over worries their air bags could malfunction. Vehicle owners in hot and humid climates are under special alert.

Three Denver-area teenaged girls were arrested after leaving the U.S. and seeking to join militants of the Islamic State in Syria. The teenagers were arrested in Germany over the weekend and returned home by the FBI on Monday. Robert Siegel talks to Megan Verlee of Colorado Public Radio.