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Air pollution comes from many sources — power plants, industrial production and fires, to name a few. In Pittsburgh, the most polluted city east of California, according the American Lung Association, avoiding dirty air while outdoors can be difficult, if not impossible. But a new device, available through the public library system, helps people identify and reduce bad air quality inside their homes.

Around this time 70 years ago, following the liberation of Nazi concentration camps in Europe, the world was coming to grips with the scale of the holocaust, and how to deal with crimes so horrendous, they're almost incomprehensible.

That process is still ongoing.

Right now in Germany, a 93-year-old former Nazi who served at Auschwitz is on trial. Holocaust survivor Eva Kor flew to Germany to testify about her experience in the camp.

Copyright 2015 NPR. To see more, visit http://www.npr.org/.

Defense Secretary Ash Carter says that Iraqi forces lack the "will to fight" the self-declared Islamic State and that they lost western Anbar province to the extremist group despite outnumbering their opponents.

Malaysian authorities say they've discovered numerous gravesites in at least 17 abandoned camps used by human smugglers along the Thai-Malay border. The dozens or possibly hundreds of bodies are thought to be migrants from Myanmar and Bangladesh.

Voice of America quotes Malaysia's Home Minister Zahid Hamidi as telling reporters today that the graves had been found near villages used by people traffickers.

Updated at 12:01 p.m. ET

John Forbes Nash, Jr., the Nobel laureate known for his groundbreaking work on game theory and differential equations, was killed along with his wife in a taxi crash on the New Jersey Turnpike, police say. He was 86.

His death was first reported by NJ.com citing a police official. NPR has confirmed the report through longtime colleague Louis Nirenberg. The couple were killed on Saturday.

Greece is warning that unless it can reach a deal with its creditors, it will be unable to make a debt payment to the International Monetary Fund next month.

Interior Minister Nikos Voutsis, speaking on Greek television, said bluntly that four installments totaling 1.6 billion euros ($1.76 billion) "will not be given and is not there to be given."

Hundreds of villagers in Nepal have fled to higher ground after a landslide today cut off the flow of a major river, creating a dam that could burst at any time, inundating towns downstream.

NPR's Julie McCarthy, reporting from New Delhi, reports that authorities are warning residents that the blockage of the Kali Gandaki River could burst and that torrents of water could sweep away villages for miles downstream.

"We have asked villagers along the river side in these districts to move to safer places," Interior Ministry official Laxmi Prasad Dhakal told Reuters.

Former Panamanian President Ricardo Martinelli wasn't always rich.

One of Central America's richest and most eccentric former politicians, Martinelli started off as a credit officer at Citibank in Panama. He bought one business, then another. Among his holdings is the country's largest supermarket chain, Super 99, known for bargain prices and catchy jingles.

But while his jingles may get Panamanian's hips moving, Martinelli's alleged pilfering and profiteering make their blood boil.

Copyright 2015 NPR. To see more, visit http://www.npr.org/.

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