Atmospheric scientist Ira Leifer installed special air sensors on a camper, then drove from Florida to California, measuring methane levels all along the way. More than 6,000 readings later, he found some noticeable spikes, especially around petrochemical plants and urban areas like Los Angeles.

On today's show: Three short stories about trying to figure out what things are really worth. Also, an update on our t-shirt project.

On this week's show, we talk about grieving and fighting when shows are canceled, we come up with some rules of engagement when it comes to good manners and culture, and we talk about what's making us happy this week.

Demand increased recently, leading to widespread shortages. An economics textbook would say ammo sellers should have raised prices rather than have empty shelves. But that hasn't happened.

Unlike cardiology and most other fields of medicine, psychiatry still hasn't developed discrete, biological tests for diagnosing illnesses of the mind. That's because the brain "hasn't yielded its secrets yet," one psychiatrist says.

The U.S. will soon begin to open combat positions to women. That's already the case in Israel, where women say it is an important step but doesn't guarantee full equality. The military's upper echelons remain male-dominated.

U.S. reconstruction teams have spent a decade building roads, bridges and other pieces of infrastructure that are badly needed in Afghanistan. But now the international effort is winding down, and it's not clear how much the Afghans will be able to do on their own.

For decades, the role of breadwinner was reserved for men, but today, more than a quarter of American working women earn more than their spouses. That means more fathers are opting to stay home with the kids.

Florida International University's medical school has made community-based health care a central part of its curriculum. With home visits and a mobile health clinic, students connect with families in neighborhoods where medical care is scarce.

After living underground in the United States — figuratively speaking — some undocumented immigrants deported to the Mexican border city of Tijuana have been driven — quite literally — underground. They're living in holes along Tijuana's fetid sewage canal for protection against police.