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Twice a day, like clockwork, people release balloons around the world at the same time. These balloons are scientific tools, and the people releasing them are meteorologists.

Hardly anyone roasts American chestnuts over an open fire anymore: A blight all but wiped out the trees they grow on. Now the discovery of a soaring survivor could aid efforts to breed a hardier tree.

Delegates from nearly 200 countries will continue to talk past the original Friday night deadline, and hope to have an agreement Saturday. Conflicts over money and oversight remain as sticking points.

A long line of mourners queued up Friday to pay their respects to the late Supreme Court justice, whose body is lying in repose.

The country's Human Rights Commission accuses federal security forces of nearly two dozen extrajudicial killings during a raid in Michoacan last year. Police are said to have attempted a cover-up.

President Obama announced Wednesday more U.S. troops than planned will remain in Afghanistan through the remainder of his presidency.

New studies show how much a country loses if it discriminates. Not only would the women themselves benefit — to the tune of $9 trillion in developing countries alone — the national economy would, too.

Each year the U.S. spends billions of dollars on unnecessary tests and treatments that result from inaccurate mammograms, some scientists say. They're calling for more selective screening.

A few passengers were injured when an airliner skidded off the runway at LaGuardia Airport in New York on Thursday. A snow storm is disrupting air travel in the region.

Calling the shootings "questionable," a civil rights attorney in Oakland requested action by the Justice Department. The Salinas police chief said that would be premature.