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Fossils found in northern China show that some of the first birds on Earth lived on the water. The exquisitely preserved fossils, resembling modern ducks or loons, lived 110 million years ago, when many forms of today' animals started to take shape.

An experiment confirms that a weird tribe of particles known as neutrinos actually change from one form into another as they journey about the cosmos. Neutrinos seem to pass through any object. If that's really the case, are neutrinos cursed to wander the universe in solitude forever?

For millennia, observant Jewish women have made monthly trips to a ritual bath called a mikvah for a kind of spiritual cleansing. In recent generations, the practice was dismissed by liberal Jews as demeaning. Now, some feminist Jews are reinventing the ritual.

U.S. and Iraqi forces launch an operation to take control of the insurgent stronghold of Ramadi, west of Baghdad. Violence there has taken a high toll on U.S. forces; it's considered one of the most dangerous places in Iraq.

After months of fighting and shelling, Ukraine has ended its combat mission in Mariupol, and its remaining soldiers have been evacuated to Russian-held territory.

People living near the Susquehanna River in Wilkes-Barre, Penn., are returning to their homes as river waters recede. But flooding still threatens other communities in Pennsylvania, New Jersey and other parts of the Northeast.

Ernesto Miranda, aka "Smokey," was a co-founder of the infamous Mara Salvatrucha gang in Los Angeles. At 38, he was studying law and working to keep kids out of gangs. All that ended Saturday night, when he was shot to death, apparently in retaliation for his anti-gang efforts.

A new report from the U.S. Census Bureau finds that the population of the United States is becoming much more diverse, due in part to a significant increase of American-born Hispanics. Farai Chideya talks about the report with Greg Harper, a demographer at the Census Bureau, Roberto Suro, director of the Pew Hispanic Center, and William Frey, a demographer at the Brookings Institution.

In the first part of a two-part interview, former U.S. Poet Laureate Billy Collins guides us through the new spoken-word four-CD box set Poetry on Record: 98 Poets Read Their Work, 1888-2006.

Tulane University in New Orleans held its graduation ceremony Saturday after a traumatic year. Students who held on through Katrina and nine months of recovery heard advice and admonitions from former Presidents Bill Clinton and George H.W. Bush.