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The cluster, found in central Appalachia and first reported by NPR, indicates that a disease once thought to be on the decline is still a common killer among coal miners.

Pulitzer Prize-winning journalist Steve Coll warns that there is no end in sight to America's longest war: "Most of the generals ... say in public, 'There's no military solution to this war.'"

The bill to keep the government funded until March 23 goes to the Senate, which is expected to change it. Senate leaders say they are closer than ever to reaching a long-term budget deal.

The private space company has launched the Falcon Heavy, a rocket more powerful than any other in use today. It's now bearing a roadster into an elliptical Earth-Mars orbit. Watch the rocket's flight.

The trash was piling up in the gutter. A young man in Nigeria wanted to get local kids to help clean it up. His campaign has gone viral.

The American system of financing campaigns is changing, as post-Watergate reforms crumble beneath a crush of unregulated money.

With three fatal train accidents in recent weeks, there's been a cry for Positive Train Control, a system that will automatically stop trains before certain types of accidents can happen. WIlliam Vantuono, editor-in-chief of Railway Age, explains how PTC works and why it's taking so long for it to be widely adopted.

Dozens of cities are vowing to cut their carbon emissions and uphold the U.S. commitment to the Paris climate deal. Despite progress, many are falling short of their most ambitious goals.

Influential physicist Joseph Polchinski has died at 63. Caltech Professor Sean Carroll remembers Polchinski and the significant contributions he made to theoretical physics.

The measure would make it illegal to accuse Poland of complicity in crimes committed by Nazi Germany. First, the controversial legislation will go to constitutional tribunal for review.