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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?

As summer officially arrives this week, it's time to think about books to buy, borrow or check out of the library. Dr. Abraham Verghese, director of the Center for Medical Humanities and Ethics at the University of Texas Health Sciences Center at San Antonio, offers a brief reading list.

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.

Last year, Tennessee dropped some 200,000 people from TennCare, its health plan for the poor and uninsured, and reduced benefits for hundreds of thousands more. In Cocke County, one of the state's poorest, the repercussions are felt far and wide.

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.

Darrell Scott grew up on a tobacco farm in Kentucky, just like his father, Wayne. Now Darrell is a Nashville singer and songwriter with albums and awards to his credit. And his father, at 71, is releasing a debut album.

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.

There are plans to bring a new dump to Uniontown, Ala., where the county commission approved the project because the area desperately needs jobs. Commentator John Fleming says this is the kind of case that has been labeled "environmental racism."

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.

Everyone suddenly wants to learn Mandarin Chinese. The problem is that there are few credentialed teachers. Now the Chinese government is making plans to develop teaching partnerships with U.S. public school districts.