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A Russian computer security firm says it has discovered that about 600,000 Apple computers have been infected with a "Flashback Trojan" virus.

Now, before we move on, you should know that the company making the announcement is Dr. Web, which sells anti-virus software that will protect a computer against that kind of virus. It's also important to note that many of the parties weighing in are part of a security community that makes money off selling anti-virus software.

Tonight, in Whitesville, W.Va., mourners will silently walk with candles on sidewalks lined with luminary lights to remember the 29 coal miners who died two years ago today in the nation's worst mine disaster in 40 years.

That memorial will follow a 3 p.m. ET event in Beckley,W. Va., where an honor guard will ring a bell 29 times to mark the moment the Upper Big Branch coal mine erupted in a massive explosion.

Dennis Walcott oversees a school system with more than one million students. Graduation rates are below the national average, and studies suggest most of the city's high school graduates are not ready for college. But Chancellor Walcott tells host Michel Martin that, after one year on the job, New York City schools are on the mend.

Race is central to the debate surrounding Trayvon Martin, the black Florida teen shot by neighborhood watch volunteer, George Zimmerman. Many media outlets first identified Zimmerman as "white," but his father describes him as a Spanish-speaking minority. Host Michel Martin explores the question, "who is white?" with sociologist Jean Halley.

Mitt Romney has taken the lead in voter support in Pennsylvania, according to a new poll from Public Policy Polling which shows the Republican frontrunner ahead of Rick Santorum, the former U.S. senator from the Keystone State, 42 percent to 37 percent. That lead was just on the 4.9 point margin of error, suggesting a tie. That's bad news for Santorum, however, as he dropped six percentage points while Romney gained 17 percent from a month ago.

The number of people filing first-time claims for unemployment insurance stayed around a four-year low last week, the Employment and Training Administration just reported.

It says there were 357,000 such applications, down 6,000 from the previous week's revised figure of 363,000.

Claims have been running at the lowest rate since March and April 2008 for several weeks now.

Finding out that you have cancer greatly increases the risk of death by heart attack or suicide, according to a new study. That risk is especially big in the first week after getting the bad news.

They're teeing off this morning in Augusta, Ga. It's the Masters, the first of the "major" tournaments for men each year.

Fans had a chance to be immortalized in the stadium by buying personalized bricks. The animal rights group PETA bought one. The group's brick contained a hidden message that spells out an anti-fishing website.

The human toll from the financial crisis in Greece now has a human face.

After 77-year-old retired pharmacist Dimitris Christoulas killed himself Wednesday outside the parliament building in Athens, a suicide note he left was reported to say that he felt he must take a "dignified end to my life" because austerity measures and "annihilated all traces for my survival," particularly his pension.

A Seattle man came home to discover that his dog had eaten his tickets to the Masters in Augusta, Ga. After the dog threw up, he managed to re-assemble the tickets. After all that effort, the Masters says they'll re-print his tickets anyway.

Mitt Romney is closer to winning the GOP presidential nomination after primary victories this week in Wisconsin, Maryland and Washington, D.C. Halfway through the GOP nominating season, Romney's attacks on President Obama are intensifying.

A Spanish bond auction went poorly Wednesday, suggesting that Spain may be becoming the next Greece. It was the first auction without a lot of help from the European central bank.

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RENEE MONTAGNE, HOST:

And our last word in business today is cardboard to classy.

Today, Domino's Pizza is hoping to complete its rebranding as a place that does not sell lousy pizza. The effort started a couple of years ago when the company actually criticized itself in ads like this one.

(SOUNDBITE OF DOMINOES PIZZA AD)

UNIDENTIFIED WOMAN: Dominoes Pizza crust, to me, is like cardboard.

STEVE INSKEEP, HOST:

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RENEE MONTAGNE, HOST:

This is MORNING EDITION from NPR News. I'm Renee Montagne.

STEVE INSKEEP, HOST:

And I'm Steve Inskeep.

Martin Luther King was assassinated 44 years ago this week. When people in Miami held a rally to mark that anniversary, local activist Billy Hardemon brought up the killing of another Martin.

BILLY HARDEMON: Two Martins that died too young, Trayvon and Martin Luther King.

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STEVE INSKEEP, HOST:

The Master's begins today in Augusta, Georgia. It's the first of the four majors that punctuate the golf season, and the only one of the majors that is always played at the same course: the perfectly manicured Augusta National. Behind the gorgeous imagery, the private golf club is dealing with an awkward issue, and USA Today sports columnist Christine Brennan is here to talk about it.

Christine, good morning once again.

CHRISTINE BRENNAN: Good morning, Steve.

The last big ice age ended about 11,000 years ago, and not a moment too soon — it made a lot more of the world livable, at least for humans.

But exactly what caused the big thaw isn't clear, and new research suggests that a wobble in the Earth kicked off a complicated process that changed the whole planet.

Ice tells the history of the Earth's climate: Air bubbles in ice reveal what the atmosphere was like and what the temperature was. And scientists can read this ice, even if it's been buried for thousands of years.

Two of America's best-known companies, Coca-Cola and PepsiCo, have dropped their memberships in the American Legislative Exchange Council, a low-profile conservative organization behind the national proliferation of "stand your ground" gun laws.

If there's one building in Jerusalem that represents the city's tangle of religions, this is it. The ground floor is a Jewish holy site said to house the tomb of the biblical King David. The second floor is the Cenacle, a Christian holy site, the room believed to be the site of Jesus' Last Supper. On the roof, there's an old minaret from when this place was marked a Muslim holy site.

One building, three religions, decades of property disputes. And the fight isn't over.

A final report from Los Angeles coroner is shedding some light on Whitney Houston's last hours.

According to the report, the pop super star complained of a sore throat and an assistant suggested she take a bath. By the time the assistant got back to the room after running an errand, she found Houston lying face down on in the tub "in approximately 13-inches of water," People Magazine reports.