Mark Memmott

So, it looks like all that talk about the Mayan calendar and the end of the world coming today was just ... talk.

But the fun continues. NASA's Voyager 2 Twitter feed, for instance, has this:

"END MAYACAL BTUN 12.19.19.17.19 SHUTDOWN:UNIV(12) BEGIN BTUN 13.0.0.0.0 BOOT:UNIV(13)."

The latest stories about how the nation is reacting to last Friday's school shooting in Newtown, Conn., which left 20 first-graders and six adults dead at Sandy Hook Elementary School, include:

There was a 5.9 percent rise in sales of previously owned homes in November from October, the National Association of Realtors says.

At their 5.04 million annual rate, sales were the highest since November 2009.

"Momentum continues to build," NAR chief economist Lawrence Yun says in the organization's report.

The New York Stock Exchange will be acquired by IntercontinentalExchange of Atlanta in a deal valued at about $8.2 billion, the two rivals confirmed Thursday morning.

In matching press releases, they say the sale "combines two leading exchange groups to create a premier global exchange operator diversified across markets including agricultural and energy commodities, credit derivatives, equities and equity derivatives, foreign exchange and interest rates."

The best estimate of how quickly the economy was growing in the third quarter has been revised upward again — a sign that as summer turned into fall things were better than first thought.

The Army staff sergeant accused in the March 11 murders of 16 Afghan civilians and shooting of six others could be given the death penalty if he's convicted of all the charges officially filed against him this week, a General Court-Martial Convening Authority announced Wednesday.

Staff Sgt. Robert Bales, 39, prosecutors say, attacked two villages near his base in southern Afghanistan. Among the 16 people killed, nine were children.

There are reports from a variety of states about local lawmakers who want to give teachers the right to bring guns to school. They're making the case that school shootings such as the one Friday in Newtown, Conn., that left 20 small children and six adults dead could be prevented or stopped if some school staffers were armed.

With the end-of-year deadline looming on automatic tax increases and spending cuts, President Obama on Wednesday made the case that Republicans should recognize "I have met them at least halfway in order to get something done for the country."

Saying the nation has a "deep obligation" to take steps to reduce gun violence, President Obama confirmed Wednesday that he's asked Vice President Biden to head a task force charged with drafting "concrete proposals, no later than January."

And, Obama said, he will push them "without delay."

Making the case that the "Plan B" proposed by House Republicans to keep the federal government from going over the so-called fiscal cliff at the end of the year "does not meet the test of balance," the White House announced this morning that President Obama would veto such legislation if it came to his desk.

Some of today's headlines and news about the shootings at an elementary school in Newtown, Conn., last Friday. Twenty children and six adults were killed by the gunman who attacked Sandy Hook Elementary:

Writing that "after four of the most challenging years in the nation's history, his chance to leave office as a great president who was able to face crises and build a new majority coalition remains within reach," Time magazine has named President Obama its "person of the year."

The others on Time's "short list" were:

Swiss banking giant UBS AG has agreed to pay $1.5 billion in fines to regulators in the U.S., Britain and Switzerland for its part in a scheme to manipulate the London interbank offered rate (LIBOR), which is used to set rates on contracts around the world.

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

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.

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:

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.

(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.

It's time to talk about both banning assault weapons and how the nation treats those with mental illness, one of the Senate's most notable "gun rights" Democrats said today.

Friday's mass shooting at an elementary school in Newtown, Conn., "has changed where we go from here," West Virginia Sen. Joe Manchin said on MSNBC's Morning Joe show.

Schools across the nation are adding security or assessing their safety procedures after the shooting deaths of 20 first-graders and six teachers or administrators at an elementary school in Newtown, Conn., on Friday.

As new pieces of information come in about Friday's mass shooting at an elementary school in Newtown, Conn., which left 20 children and six adults dead, we'll post them here.

The day began, just after 10 a.m. ET, with Connecticut State Police Lt. J. Paul Vance telling reporters that most of the emerging evidence is "too difficult to discuss ... I'm not going to lie to you."

Update at 6:49 p.m. ET. Dogs Try To Comfort Students.

Saying that her choice understands the business sector and is the "right U.S. senator for our state and our country," South Carolina Gov. Nikki Haley named Republican Rep. Tim Scott to replace the retiring Sen. Jim DeMint (also a Republican) at a noontime news conference today.

After asking those gathered at the state capitol to pause for a moment of silence to honor the victims of Friday's shootings in Newtown, Conn., Scott said he's honored and excited "for many, many reasons."