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The Affordable Care Act's rollout has taken the remarkable Democratic Party unity that existed during the government shutdown and smashed it to smithereens.

A study of DNA extracted from wolf and dog fossils suggests that ancient wolf populations in Europe are the direct ancestors of most modern-day domestic dogs. The study suggests wolves became dogs between 18,800 and 32,100 years ago, before the start of agriculture.

Janet Yellen cleared a key hurdle in her path to become the next chair of the U.S. Federal Reserve, after a Senate Banking Committee hearing went smoothly Thursday. The most difficult questions centered on the Fed's stimulus efforts.

The hospital says it can't guarantee the supplements' safety because of lax regulations. The Food and Drug Administration does not routinely review the manufacturing of dietary supplements, which calls their safety and effectiveness into question, doctors say.

The president says the U.S. should give negotiators more time to reach a deal on Tehran's nuclear program before passing tougher restrictions.

Animated GIFs of satellite images show the before and after effects of Typhoon Haiyan in the Philippines.

Unlike the technologies in laptops, smartphones and electric cars, the batteries inside them have been slow to evolve. In Silicon Valley, more than 40 companies are working on finding a battery breakthrough. And they're facing international competition.

It came as little surprise that President Obama, an avid sports fan, leaned heavily on sports metaphors at his press conference Thursday to help explain the problems the administration has experienced rolling out the Affordable Care Act. His recent predecessors had similar tendencies when they wanted to convey ideas to the American public in simpler terms.

Food labels have become battlegrounds. Government regulators, companies and food movement activists have been fighting over what belongs on the label. (GMOs? Trans fats? Claims that bran prevents heart disease?) We asked four big thinkers for their dream food label.

Scientists suspect that warming air and rivers, as well as smaller winter snowpack, is endangering western trout. But on a ranch in Montana, methods to protect trout from the effects of cattle ranching are helping the trout become more resilient to the inevitable change in their environment.