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You may be paying $38,000 more for that knee replacement than someone in another state, or even a few hundred miles down the road. And there doesn't seem to be any method to this madness.

Eighteen months after a concussion or other traumatic brain injury, two-thirds of the patients in a recent study were still sleepy during the day. And most were unaware of their symptoms.

The $5 billion Shanghai company was the third financial firm to collapse in China since December. "Every time I take a bite of food," says an investor who lost everything, "I feel I am wasting money."

In the past 24 hours alone, the whiplash between what rival-turned-uneven-surrogate Ben Carson called the "two different Donald Trumps" was on bold display.

Police Commissioner Kevin Davis says detectives mistook the replica for a real gun and describes the boy's injuries as nonfatal. The shooting happened on the anniversary of Freddie Gray's funeral.

She's a Living Goods agent. The company styles its door-to-door health care deliveries after American businesses like Avon, Amway and Tupperware.

The Red Dragon missions are aimed at figuring out what's needed "to land large payloads propulsively on Mars." For now, the plan doesn't include sending astronauts to the red planet.

Scientists identified two genetic variants that make it more likely that a woman will give birth to fraternal twins. Knowing this might help develop safer fertility treatments.

The incident prompted calls for more drone regulation, but a U.K. lawmaker now says it probably was not a drone that struck the plane. And an investigation has ended because of a lack of evidence.

The brother of gunman Syed Rizwan Farook was among those taken into custody over what federal prosecutors say was a conspiracy involving a "sham marriage."