Scott Neuman

A man has been killed in what reports described as a machete attack in London, and police have shot two suspects in what British Prime Minister David Cameron says is likely a terrorist incident.

When Randy Keller moved from Texas to the Oklahoma City area seven years ago, he couldn't find the house he was looking for.

"I was moving from Texas, where there are also a lot of tornadoes," says the professor of geology and geophysics at the University of Oklahoma who experienced the 1970 tornado in Lubbock, Texas. "But I just couldn't find one."

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

Our colleague Andy Carvin has scanned Twitter in search of reaction, including photos and video, from the massive tornado that swept through central Oklahoma on Monday.

Among the tweets:

Sidney Montoya of Oklahoma City says he is "Praying for my little cousins in Moore, their elementary school just got hit by the tornado."

Federal aviation officials have ordered that more than 1,000 Boeing 737s be examined to see if a key part on the plane's tail section needs to be replaced, The Wall Street Journal reported Monday.

The Federal Aviation Administration issued the airworthiness directive for a pin that holds the 737's horizontal stabilizer to the rest of the tail, to see if it is in danger of failing prematurely. The horizontal stabilizer — also known as the tail plane — enables the pilot to control the aircraft's pitch.

Margaret Thatcher, the iconic former British prime minister, died Monday at age 87 after suffering a stroke. Although she was a towering presence on the world stage in the 1980s, often standing shoulder to shoulder with fellow conservative President Ronald Reagan, some people may have forgotten her contributions.

We decided to highlight five things you ought to know about her:

She helped break the glass ceiling in politics.

As an icon of the American conservative movement in the 1980s, it would have been difficult to find a more unlikely figure than Britain's Margaret Thatcher, who died Monday following a stroke.

Thatcher became prime minister in 1979, a full year and a half before Ronald Reagan became president. She hailed from a country seen as a hopeless bastion of socialism by conservatives, many of whom, like Reagan himself, were strongly invested in the idea of American exceptionalism.

A group of astronomers believe they have found a new kind of "mini" supernovae that appear to share traits with other previously known types.

Until now, only core-collapse supernovae, the grand finale of stars approximately 10 to 100 times more massive than our sun, and Type Ia, which occur when certain conditions exist in binary (two-star) systems, were known to exist.

Former Secretary of State Hillary Clinton has announced that she supports same-sex marriage, saying gays and lesbians are "full and equal citizens and deserve the rights of citizenship."

"That includes marriage," Clinton says in an online video released Monday by the gay rights advocacy group Human Rights Campaign. Clinton adds that she backs gay marriage both "personally and as a matter of policy and law."

The new pope, 76-year-old Jorge Bergoglio, the archbishop of Buenos Aires, is the first pontiff from Latin America and the first Jesuit, but he appears to hold views very much in line with his predecessor, Pope Benedict XVI.

Bergoglio has chosen the papal name Francis, becoming the 266th to hold the title of spiritual leader of the Catholic Church.

Some sloppy coding on an update to Microsoft's Windows 7 two years ago has cost the computer giant a $731 million fine to the European Commission.

Microsoft said Wednesday it would not contest the fine, imposed for what the commission said was the company's abuse of its market dominance to stifle competitors' Web browsers.

Two reports on troubles with lithium ion batteries aboard Boeing's 787 Dreamliner:

In Japan, where a battery on an All Nippon Airlines 787 overheated and began smoking on Jan. 16, forcing the plane to make an emergency landing, the Transport Ministry released a report Wednesday saying it found that the battery in question had been improperly wired.

Police on Sunday said 20-year-old Adam Lanza was armed with a high-powered rifle, two handguns and hundreds of rounds of ammunition when he forcibly entered a Newtown, Conn., elementary school and proceeded to gun down 20 young students and six faculty members.

The latest information on the tragedy, the worst violence at an elementary school in U.S. history, came ahead of President Obama's arrival in the town where Friday's mass shooting took place. The president met with families of the victims and planned to attend an evening vigil, where he will speak.

For most of us, Election Day marks a welcome end to months of relentless political ads and partisan bickering. You show up at your polling place, run the gantlet of sign-wielding campaign volunteers, and join your fellow Americans in long lines that inch toward the voting booth.

There are political races all over the country that aren't even close, but you wouldn't know it from listening to the candidates.

It seems that every behind-the-curve challenger is scrapping his or her way to victory and every ensconced incumbent is fighting an unexpectedly tight contest.