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It's a nervous time for companies that make and sell guns.

On Tuesday, Cerberus Capital Management, a private equity firm, announced it was selling its stake in Freedom Group, maker of the American Bushmaster AR-15 rifle, which was used in the Newtown killings last Friday, along with other brands such as Remington.

A growing number of lawmakers are indicating they are open to considering new gun control measures in the wake of Friday's school shooting in Newtown, Conn. But while much of the national debate has focused on limiting access to guns, others are suggesting that schools should arm themselves to defend against attacks.

David Thweatt, school superintendent for the small Texas town of Harrold, northwest of Fort Worth, decided in 2006 that it was time to arm his staff. There's only one school in Harrold, a K-12 with 103 students.

The gang rape of a young woman on a bus in Delhi has touched off outrage and soul-searching in the increasingly unsafe Indian capital.

Spontaneous protests have erupted, while anguished members of Parliament decried the attack.

Parents drill certain warnings into their children: don't drink, don't smoke and don't do drugs. But those conversations have gotten tougher now that two states, Colorado and Washington, have decriminalized some recreational marijuana use.

The folks at the California Institute of Technology have built another Mars rover, but this one will never get to leave Earth. Not surprising, really, since it's made of gingerbread.

This time of year, many are thinking about giving to one charity or another and wondering just how much good their donations will do.

Fielding questions from reporters Friday in the first hours after the mass shooting at Sandy Hook Elementary School, Connecticut State Police spokesman Lt. J. Paul Vance made one thing perfectly clear: The news media could consider him the one and only reliable source for information on the tragedy.

Despite a slowdown in U.S. consumption, coal is poised to replace oil as the world's top energy source — possibly in the next five years, according to the International Energy Agency. The rise will be driven almost entirely by new energy demands in China and India, the IEA says.

NPR is not identifying the author, a Syrian citizen, for security reasons.

Ask the average person — even in Washington — who serves as President Obama's chief of staff and you'll probably get a blank stare.

Jack Lew hasn't been heard or seen in the "fiscal cliff" drama unfolding between the White House and Congress. But the former budget director, who took over the top White House job last January, has become a key player behind the scenes.

President Obama has thrown his support behind a leading Democratic senator's effort to reinstate a ban on assault weapons — another sign that Friday's mass shooting at an elementary school in Connecticut has put gun control back on Washington's political agenda.

Opportunists who market street drugs may be undermining the global struggle against AIDS.

In South Africa, two mainstay HIV drugs have found their way into recreational use. That may help explain why some HIV patients are resistant to these front-line medicines even if they've never been in treatment before.

It can happen in two ways.

Global efforts to combat malaria are under threat from new strains of drug-resistant malaria, which are cropping up in Southeast Asia.

Over the last decade, the number of malaria deaths around the world has dropped sharply, from just over 1 million in 2000 to roughly 600,000 last year.

Much of that progress is due to the widespread use of drugs containing artemisinin. The new malaria drugs quickly kill the parasite.

Paula Broadwell, whose affair with retired Gen. David Petraeus led to his resignation from the post of CIA director, will not face federal charges related to the alleged cyberstalking of another woman, according to a letter sent by the Justice Department to Broadwell's attorney.

Robert Muse, Broadwell's lawyer, has released the letter from Assistant U.S. Attorney W. Stephen Muldrow that says, in part:

You may remember Danica McKellar as Winnie Cooper in The Wonder Years. Today, the actress is also a math advocate and the author of Girls Get Curves: Geometry Takes Shape. In Tell Me More's 'In Your Ear' series, McKellar talks about the songs that helped her beat stress as a teen and inspire her as an adult.

There's a lot of talk about students struggling in K through 12 classrooms. But once they get to college, many students fall even further behind. Host Michel Martin speaks with Sarah Gonzalez, NPR's StateImpact Florida reporter, about the high number of college students enrolling in remedial classes.

There are some warnings parents drill into their kids: don't drink, don't smoke, and don't do drugs. Now that Washington state and Colorado have legalized marijuana, those conversations just got more complicated. Host Michel Martin speaks with pediatrician Dr. Leslie Walker for advice on how to talk with young children and teens about marijuana.

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MICHEL MARTIN, HOST:

This is TELL ME MORE from NPR News. I'm Michel Martin. Coming up, now that a couple of states have legalized the recreational use of marijuana, can parents still tell their kids to just say no? We'll hear from a pediatrician who works with substance-addicted teens about why it's still important to have the talk about drug use, and to pay attention to what you as a parent are modeling with your own behavior. That's coming up.

Democratic Senator Daniel Inouye of Hawaii passed away Monday at the age of 88. Inouye was one of the longest-serving members of the Senate and a veteran of World War II. Host Michel Martin pays tribute to the senator, reprising a conversation they had on the 70th anniversary of the attack on Pearl Harbor.

It's not the cutting, it's the uncertainty.

That's the lament these days from governors and mayors awaiting the outcome of federal budget negotiations.

They know they're likely to take a hit; they just don't know how bad it's going to be.

"How do you budget for the unknown?" wonders Ed Long, the county executive in Fairfax County, Va. "Our worst fear is that by [the federal government] not acting, the economy is going to get worse going forward."

Before he forced his way into Sandy Hook Elementary School on Friday and began a rampage that would leave 20 children and six adults dead, police say, 20-year-old Adam Lanza killed his mother at their home in Newtown, Conn.

Who was Nancy Lanza, 52?

A picture is emerging.

Everyone knows that quitting smoking is one of the surest ways to reduce the risk of dying.

But it has taken a long time for some Medicare beneficiaries to get the same kind of help with quitting that's routinely available to people with private health insurance.

We've had to focus on news about the school shootings in Newtown, Conn., since Friday, which means we missed some interesting stories over the past few days. NPR intern Rachel Brody shares one of them.

This is a story about a daily commute that spanned regimes, not just miles.

(Scroll down for updates on the GOP's "plan B" and White House rejecting it.)

Talks are "heating up."

Differences are "narrowing."

NBC News chief foreign correspondent Richard Engel and two members of his production team are free after five days of being held captive in Syria.

The network says Engel and his colleagues were traveling with rebels in Syria last Thursday when they were kidnapped by armed men. Their captors "executed one of the rebels 'on the spot,' " NBC says.

Monday evening, NBC reports:

Most students returned to school today in Newtown, Conn., site of Friday's mass shooting at an elementary school that left 20 first-graders and six adults dead or dying.

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DAVID GREENE, HOST:

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DAVID GREENE, HOST: