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Passenger pigeons used to be the most abundant bird in North America. But hunters drove them to extinction, and by 1914, only one was left. A century later, that pigeon, named Martha, is on exhibit.

Every year, money transfer brokers help Somali-Americans send more than $200 million to family members in Somalia. But one of the few banks to support that process will soon back out.

The number of Central American children seeking entry into the U.S. has grown dramatically. The U.N. calls it a refugee crisis, but the GOP blames administration policies for encouraging migrants.

Al-Qaida has gained control in an area where 1,300 U.S. troops lost their lives during the Iraq War. Troops who came home are now wondering whether it was all in vain, the Arizona Republican says. He says the total withdrawal of troops from Iraq left a vacuum that's being filled by America's enemies.

Alarms are good and necessary things in hospital care — except when there are so many that caregivers miss signals of a patient in crisis. Trying to conquer "alarm fatigue," one hospital turned off the beeps — and found that patient care actually improved.

From coast to coast, the invasive insect is costing U.S. farmers millions in crop damage, and it has become a smelly nuisance for homeowners. But researchers say they may have found some low-tech solutions to the stink-bug menace.

Some donors willing to write seven-figure checks to superPACs have gotten something they weren't counting on: attention from the political opposition and the media. One donor says he feels like he has a "target strapped on my back."

Climate change is exaggerating the normal swings in weather. For the American Southwest, that means more intense waves of heat, drought and fire that could wipe out trees that have stood for centuries. It's already revamping the ecology of the landscape.

A wave of kidnappings and an alleged bombing plot — both linked to the uprising in neighboring Syria — are shaking Lebanon's precarious sectarian balance. But the foreign patrons of Lebanon's political factions are preoccupied with Syria and appear unwilling to bankroll a proxy war in Lebanon, at least for now.

Just how do trees die? It seems like a simple question, but the answer still eludes scientists. And understanding forest ecology is increasingly important as the effects of climate change begin to take root.