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Researchers writing in the journal Science say that if the rate of global warming goes unchecked, the frequency of lightning strikes will increase by 50 percent.

The animal, which was spotted Thursday, was initially thought to be a tiger. Officials now say it's not, but they aren't sure what it is. One theory is that it's a lynx.

After a major investigation into America's nuclear forces, Secretary of Defense Chuck Hagel says that he will be investing billions of dollars into the system, and changing to the way it's managed.

Women who turn to law enforcement for help are often frustrated that authorities aren't doing enough. Police say tracing the culprits can be a complicated and time-consuming process.

There are lots of cardiovascular risk calculators, but they usually expect you to know your blood pressure and cholesterol numbers. This one wants to know if you play tennis. And if you like bacon.

The intrusion occurred last month. Although defense analysts have said Russia is the likely culprit, Swedish authorities say it's "impossible" to say whose submarine it was.

Filmmaker Frederick Wiseman's latest documentary takes audiences behind-the-scenes at London's National Gallery and delves into the stories being told in paintings. Wiseman tells NPR's Robert Siegel what he learned and how he goes about filmmaking.

The apparent mass murder of 43 student-protesters near the town of Iguala has provoked national outrage over the investigation into their disappearance. Political leaders are taking heat for their handling of the case.

Open enrollment in Obamacare resumes Saturday. While no one expects a repeat of last year's disastrous launch, millions of people will be trying to renew coverage or sign up for the first time.

One of the largest public school systems in the U.S. dropped religious affiliations for holidays on its school calendar. The decision represents a classic church and state battle.