National security, unlocked. Each Thursday, host Mary Louise Kelly and a team of NPR correspondents discuss the biggest national security news of the week. With decades of reporting from battlefields ...

The most recent daily Weather World (updated each weekday after 6 p.m.). From the Outreach Studios in the Department of Meteorology and Atmospheric Science at Penn State, this is the most recent daily ...

While particulate matter air pollution from human activity in transportation, households and industry is decreasing in Europe, thanks to strict regulations, another source is developing in the ...