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Melissa Block talks to Casey Mongold, owner of Casey's Tire and Auto in Moore, Okla., where a tornado caused widespread destruction on Monday.

Melissa Block talks to Jon Hamilton about the science of tornadoes.

NBC News has put together a time-lapse video of the EF-4 tornado that tore through the southern suburbs of Oklahoma City, Okla.

As we told you in the live blog, the National Weather Service says it was at least an EF-4 tornado with winds in excess of 166 mph. The tornado stayed on the ground for 40 minutes and traveled 20 miles.

Although Oklahoma is a state where tornadoes are a fact of life, few days stand out like May 3, 1999.

It's another bad day for the Justice Department.

A federal judge in Louisiana has thrown out the central criminal charge against a former BP executive because prosecutors failed to prove he knew about a pending congressional investigation into oil flowing into the Gulf of Mexico three years ago. U.S. District Judge Kurt Engelhardt also ruled that a Democratic House member who inquired about the oil flow rate was acting as head of a subcommittee, not a full congressional committee, as required under the federal Obstruction of Justice statute.

Ray Manzarek, the keyboardist and a founding member of The Doors, died Monday in Germany. He was 74.

A statement from publicist Heidi Ellen Robinson-Fitzgerald said Manzarek died in Rosenheim, Germany, after a long battle with bile duct cancer.

Manzarek and Jim Morrison founded the iconic band after meeting in California. The Doors went on to become one of the most successful rock 'n' roll acts of the 1960s — and continues to have an impact decades after Morrison's death in 1971.

Melissa Block talks to Joe Wertz of the public radio initiative State Impact about the tornado that hit the Oklahoma City area on Monday.

(This post was last updated at 9:02 p.m. ET.)

A massive tornado ripped through the southern suburbs of Oklahoma City, Monday afternoon, killing at least 51 people, according to the state medical examiner's office.

The death toll was expected to rise.

Helicopter images showed large tracts of Moore, Okla., completely leveled by what the National Weather Service says was at least an EF-4 tornado with winds in excess of 166 mph. The tornado stayed on the ground for 40 minutes and traveled 20 miles.

Microsoft hasn't exactly had a great couple of years.

Its new Windows 8 operating system was held responsible for the drop in PC sales last quarter. Sales of its Windows Phones lag far behind both the iPhone and Google's Android phones.

The light in the darkness for Microsoft has been the Xbox 360, which has been the top-selling game console for over two years — beating out both the Nintendo Wii and Sony's PlayStation. On Tuesday, Microsoft is expected to announce a new version of the Xbox.

Yahoo's $1.1 billion purchase of Tumblr could be considered a bargain compared with its other big-dollar bets. The company's history is dotted with pricey purchases of once-hot Web properties that had more promise than eventual purpose. A look back:

GeoCities, 1999: $3.7 Billion

When movie stars become unbankable, they're no longer a slam dunk at the box office. When investments become unbankable, they're relegated to the Wall Street's junk pile. For ordinary Americans deemed unbankable — those who don't have a traditional checking or savings account — it can be hard to simply pay bills.

And that absence of a bank account is about to become a big problem for those who also lack health coverage — and for the health insurance companies trying to sell them coverage. After all, how do you sell a product to a customer who has no easy way to pay you?

Fox News said that it was "outraged," after learning that the Justice Department obtained the personal emails of one of its reporters during the course of a 2009 leak investigation.

The people of Portsmouth, England, on Monday turned out to bid farewell to the aircraft carrier HMS Ark Royal, destined for a Turkish scrap yard after its decommissioning two years ago.

William von Schneidau, an intrepid butcher in Seattle, is giving a whole new meaning to "potbelly pig." Lately, he's been feeding marijuana refuse to the pigs he turns into prosciutto for BB Ranch, his butcher shop in the city's famous Pike Place Marke

The Internal Revenue Service is under fire for improperly singling out some conservative groups for extra scrutiny — putting them through months (or longer) of questions that delayed or derailed the organizations' requests for tax-exempt status.

Well, now the chairman and ranking Republican on the Senate Finance Committee have some questions and requests — actually dozens of them — for the IRS.

Over the past week, Pope Francis has launched a crescendo of attacks on the global financial system and what he calls a "cult of money" that does not help the poor.

Beijing has long been about the closest thing to an ally that Pyongyang enjoys, but the seizure of a Chinese fishing boat by unidentified North Koreans has threatened to put an already tenuous relationship on even shakier ground.

Chinese Foreign Ministry spokesman Hong Lei was quoted by The New York Times as making it fairly clear that his government was not happy about the development.

ABC News White House correspondent Jonathan Karl now says he regrets that some key parts of a major story he reported on May 10 were wrong.

After uproar over some lesson plans some conservatives deemed un-American, a Texas company has decided scrap a curriculum system used by 877 school districts that were too small or too poor to produce their own.

Singer Sarah Vaughan came up in the 1940s alongside bebop lions Dizzy Gillespie and Charlie Parker, starting out in Earl Hines' big band. Hines had hired her as his singer and deputy pianist, while Gillespie praised her fine ear for chords as she grasped the arcane refinements of bebop harmony.

Men who were diagnosed with ADHD as children are more likely to be obese in adulthood, according to a new study.

The men who had ADHD weighed 19 pounds more at age 41 than otherwise similar men who hadn't had ADHD as boys, the researchers found.

Host Michel Martin looks into why some non-profits are tax exempt, and how something like the recent IRS flap could happen. She speaks with David Cay Johnston, a columnist for Tax Analysts and reporter Brentin Mock of Colorlines.com.