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Scientists working to create the perfect atomic clock have a fundamental problem: Right now, on the ceiling, time is passing just a bit faster than it is on the floor.

In Copenhagen on Sunday, scientists gathered to issue their latest assessment of the world's climate. Their report is considered the most comprehensive overview of the state of climate science.

Al Michaels' book covers Super Bowls, Olympics, World Series and working with legends. David Greene meets the play-by-play voice, and talks to Michaels about his book, You Can't Make This Up.

The bomber attacked the tournament in eastern Afghanistan on Sunday. That came after the lower house of Afghanistan's parliament approved keeping U.S. troops in the country past the end of the year.

Dr. Prabhjot Singh lives and works in Harlem, a neighborhood plagued by chronic disease. He thinks an African model of health care can help — training people in the community to be health educators.

As an organized sector, the tech industry did not applaud President Obama's executive action on immigration; and the future of the joint campaign for a comprehensive bill is unclear.

President Obama announced his plans for immigration change that do an end run around Congress. Republicans are upset that the president is using executive actions to push through the action he wants.

There is no announcement yet from the grand jury investigating the death of Michael Brown, an unarmed, black, 18-year-old. The panel is deciding whether to indict a white police officer in his death.

President Obama announced the defense secretary's resignation Monday morning. Chuck Hagel clashed with White House adviser Susan Rice on Syria policy, and he never made it into Obama's inner circle.

A suicide bomber killed more than 50 people on Pakistan's side of the Wagah border crossing with India. The bomber apparently targeted spectators returning from a famous flag lowering ceremony.