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McDonald's says it will start to buy beef that's "verified sustainable" in 2016. But defining sustainable beef production is tricky because the environmental issues involved are so complex.

The dolls get sick on cue and come with a medical kit that can relieve their symptoms. But the electronics inside the dolls can get hot enough to cause blisters or burns.

Officials said most of the oil was drifting into the Gulf Of Mexico, perhaps limiting the impact to sensitive bird habitats.

Politicians have adopted the orange and black ribbons in a symbolic move that was first introduced by Catherine the Great in the 18th century.

American teenagers turned a 2012 video about the African warlord into an Internet sensation. Two years on, it shows the possibilities and limitations in social media marketing.

There you are: face to face, looking into her eyes, a puddle of love, when all of a sudden, you yawn. Usually, she yawns back; but what if she doesn't?

Invasive weeds are already a big headache for ranchers, who spend thousands of dollars to get rid of them. New research shows that a changing climate is likely to help many of these weeds thrive.

The company, citing religion, argued before the Supreme Court that it shouldn't have to provide contraception coverage in its health plan. The coverage is mandated by the Affordable Care Act.

Thompson has been named acting head of the Office of Legal Counsel, which approves executive branch legal arguments on armed drones, surveillance and other national security issues.

The state's once-abundant orchid population has dwindled. Conservationists hope to change that by planting lab-grown flowers in urban areas throughout South Florida.