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In 2001, Portland, Ore., was the first to develop a new kind of streetcar system. Success there led to a resurgence, with at least two dozen cities planning, building or expanding trolley lines — places like Atlanta; St. Louis, Mo.; and Tucson, Ariz. But some wonder whether it's the best way to spend limited transit dollars.

Seven months into his papacy, Pope Francis is shaking up the Catholic world, with outspoken interviews and cold calls to ordinary people. But some Catholic conservatives are deeply uncomfortable and worried that the Vatican has lost control of the papal message.

Lots of parents yell at their teenagers, but harsh verbal punishment is associated with more bad behavior on the part of the kid. Research shows that yelling is ineffective for changing behavior. A step back and a deep breath may be better options.

There are many ways to look at civil war: ethnic factions, economic divides and religions differences. But increasingly, some say we should also look at climate change as a factor as well, as it is often what forces internal migrations in nations already simmering with ethnic and sectarian tensions.

China is greeting the Year of the Horse with a little less fanfare, noise and smoke, after severe air pollution choked scores of cities last year. Firework sales are down, and more people say they're forgoing the ancient and beloved good-luck tradition for the sake of their lungs and health.

A Jordanian woman brought her camel's milk skin-care line — and a biotech startup — to Missouri. Her company is studying how the long-acting antibodies in camel's milk can help clear up acne.

The mysterious Clovis culture, which appeared in North America about 13,000 years ago, appears to be the forerunner of Native Americans throughout the Americas, a study of DNA evidence suggests. Remains from an infant buried more than 12,000 years ago at a Clovis site in modern Montana held the genetic key.

President Obama travels to Mexico on Wednesday to meet with his Mexican and Canadian counterparts. The three presidents are talking about the increased trade among their countries, 20 years since the signing of the North American Free Trade Agreement.

Young people are usually less likely to become seriously ill with flu, but this season looks like an exception to that rule. Blame the H1N1 strain. Even though the flu vaccine is less than perfect, getting a shot each year can make the illness less severe, doctors say.

A campaign in Africa to prevent HIV has persuaded 6 million teens and men to get circumcised and aims to sign up 14 million more. To do so, health officials must appeal to male vanity.