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Altogether, some 2 billion children worldwide are breathing air that has been deemed a "long term hazard," a report finds. Pollution contributes to around 600,000 deaths annually of kids under age 5.

Colorado is reviewing oil and gas operations after a fatal home explosion was linked to an abandoned, but still leaking, gas line. The tragedy is raising questions about how older wells are regulated.

Scientists in India say the frogs are actually fairly common but have eluded discovery likely because of their extremely small size, secretive habitats and unusual calls.

Tornadoes injured dozens of people as they moved through southeastern Louisiana on Tuesday. In New Orleans East, the National Guard was helping clear streets of debris and downed electrical wires.

After being free of polio for decades, Israel has detected the virus in sewers across the country. No children have become ill. But health officials are worried that polio has regained a foothold in Israel.

More than 1,000 people are dead after a 5.9 earthquake struck eastern Afghanistan overnight on Wednesday. For a country already experiencing widescale hunger and poverty, it is one more tragedy.

Aspen, maple and other trees are about to turn vivid shades of gold, orange and crimson — but when? It depends on a range of factors, from drought to local temperatures.

Colombia's first leftist president will be sworn into office Sunday, promising to fight inequality and heralding a turning point in the history of the country.

A winter storm packing powerful winds, heavy rain and potentially several feet of snow in the Sierra Nevada shut down highways, toppled trees and triggered flood watches and avalanche warnings.

Amazon announced an additional 9,000 layoffs, citing economic uncertainty. The e-commerce company has already eliminated 18,000 positions.

A truck bomb in a northern Iraq farming town populated by Shiite ethnic Turks claims more than 100 lives. Elsewhere, several more Americans lost their lives in separate incidents, and the Iraqi parliament continues to struggle over an oil law.

Supplemental insurance plans shield millions of people from Medicare's deductibles and other out-of-pocket costs. Some health economists have criticized these so-called Medigap plans for inflating health care spending by encouraging people to seek care they don't really need.

NPR's Ailsa Chang talks with Brent Davison, Troop B Commander for the New York State Police, about what it takes to search for prison escapees.

As the 51-year-old civil war in Colombia winds down, efforts to find and destroy the many mines are underway.

NPR's Juana Summers talks with mycologist Matt Kasson about a strange fungus that is threatening certain broods of periodical cicadas.

Officials said many others are feared to be trapped under debris.

Ukrainian soldiers appear to be several miles inside Russia’s Kursk region, where they are in several villages. Russia’s top military official says some 1,000 Ukrainian troops are taking part.

Schools in several Kentucky counties were closed on Monday as the search continued for Joseph Couch, 32, who authorities say is the suspect in the shooting that occurred Sunday on Interstate 75.

Heavy rains, flooding and destructive winds and tornadoes snarled traffic and knocked out power up and down the East Coast.

Russian-installed authorities in Donetsk said that the shells had been fired by the Ukrainian military and called it a "terrorist attack."