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In an ambitious bid to move beyond the electric car market, Tesla has announced that it will start selling large batteries to let homeowners store electricity. The Powerwall home battery starts at $3,000.

Tesla CEO Elon Musk unveiled the new batteries Thursday night, in a move that had been both highly anticipated and the subject of much speculation. With a sleek surface and a depth of only about 7 inches, the Powerwall can be mounted on a garage wall or another surface, indoors or outside. It's roughly 4 feet high and 3 feet wide.

Baltimore's lead prosecutor, Marilyn J. Mosby, announced on Friday that the death of Freddie Gray was a homicide. Mosby, who took office in January, is charging six city police officers with a range of offenses — including second-degree murder and manslaughter.

You might think it's easy to guess if a person is at risk of becoming overweight or developing diabetes. The behavioral traits are pretty clear – that person might exercise less or eat more. He or she might have high blood pressure, or might have gained weight.

But now there's another place to find evidence of those risk factors: in a person's pee.

Researchers are finding clues about the metabolism in human urine – most recently in more than 2,000 samples kept frozen in the basement of Imperial College, in London.

"I was sickened and heartbroken by the statement of charges that we heard today, because no one in our city is above the law. Justice must apply to all of us equally."

That's what Baltimore Mayor Stephanie Rawlings-Blake said this afternoon in response to the news that the state's attorney for Baltimore City was bringing charges against six officers involved in the arrest of Freddie Gray.

The Pillars of Creation are arguably the most iconic image captured by the Hubble Space Telescope. Here's what they look like — in images captured in 1995 and 2014.

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It's been a tough week for a couple of candidates looking to break through on the presidential stage, namely Chris Christie and Martin O'Malley.

First, in New Jersey, David Wildstein, a former Christie ally and former Port Authority official, pleaded guity Friday to charges related to the "Bridgegate" scandal that closed several lanes of traffic to the George Washington Bridge over four days in 2013, ensnaring cars in massive backups.

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RENEE MONTAGNE, HOST:

Soul Singer Ben E. King, best known for his hit "Stand By Me," has died, his publicist says. He was 76.

Phil Brown, the publicist, says King died Thursday of natural causes.

Born Sept. 28, 1938, in Henderson, N.C., King moved to Harlem, N.Y., at age 9, his biography says.

We know that sitting all day is hazardous to our health, increasing the risk of obesity, diabetes, hypertension, inflammation and atherosclerosis. It all sounds pretty dismal, since many of today's jobs require us to be nearly glued to our computer screens. But a tiny two-minute break may help offset that hazard, researchers say.

People who got up and moved around for at least two minutes every hour had a 33 percent lower risk of dying, according to researchers the University Of Utah School Of Medicine.

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