PBS NewsHour

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The majority of earth’s land and water mass is either warmer than average, much warmer than average or hitting a record warm. Image courtesy of NOAA/NCDC. Though most of the United States still shivers with memories of the polar vortex, 2014...
This annotated image shows where features seen in an observation by NASA’s Mars Reconnaissance Orbiter have been interpreted as hardware from the Dec. 25, 2003, arrival at Mars of the United Kingdom’s Beagle 2 Lander. The image was taken...
Students fill a hallway at Coolidge High School in Washington, D.C., between classes May 1, 2014. Coolidge opened as a whites-only school in 1940, today it’s students are almost exclusively African-American and Latino and from low-income...
WASHINGTON — Homeland Security Secretary Jeh Johnson said Friday he’s concerned that terrorists might use the visa waiver program to get into the United States through countries with which the U.S. has friendly relations, and his department is...