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Vice President Joe Biden and President Barack Obama are touting new proposals aimed at curbing gun violence. Host Michel Martin learns more from Paul Barrett, author of 'Glock: The Rise of America's Gun' and Craig Whitney, author of 'Living With Guns, A Liberal's Case for the 2nd Amendment.'

Zach Sayne, who died this month at age 25 in Alabama, never made it home to Georgia where his mother hoped he would be cared for. The story of why she couldn't move him there shows the bureaucratic traps, underfunding and lack of choices that plague state Medicaid programs.

JPMorgan Chase says its profits were up 53 percent in 2012's fourth quarter — but CEO Jamie Dimon's salary will be cut in half, after the bank lost billions of dollars on risky bets placed by a single trader. Dimon's salary now stands at $11.5 million.

Many young illegal immigrants can now drive without the fear of being pulled over. Under President Obama's deferred action program, many have begun receiving their driver's licenses. But not every state is on board with allowing these young people behind the wheel.

Smartphone apps that assess moles for skin cancer risk missed threatening moles one-third of the time, say dermatologists who tested some of the apps. The apps could give people a false sense of security about their skin.

Land that isn't in good enough condition to grow crops could be used to produce substantial amounts of liquid biofuels, a new study claims. But there are many concerns about the study, and about the future of advanced biofuels in the U.S. and abroad.

In 1986, Congress passed a ban on buying and selling machine guns made from then on — with the blessing of none other than the National Rifle Association. Gun law experts say the law was more significant than it seemed at the time.

Interior Secretary Ken Salazar, the latest member of President Obama's Cabinet to announce his second-term departure, ran a department responsible for a half-billion acres of public land. But it's how he dealt with the oil industry and renewable energy issues that marked his tenure.

There were more than 500 homicides in the city last year. Officials and residents are counting on President Obama's gun control package to bring that number down. "We didn't want other parents to be like us," says one Chicago mom, whose son was shot to death on a city bus.

Parents will be reassured to hear there's no evidence linking the current timeline for vaccinations to health problems. A review of all available scientific data looked at a wide range of medical conditions — including diabetes, autism and epilepsy — before declaring that there's no reason to worry.