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The man who claims to have orchestrated the Sept. 11 attacks is expected to appear in a military courtroom this Saturday. Khalid Sheikh Mohammed and four other men are supposed to answer formal charges related to their roles in the plot.

Their arraignment will be at Guantanamo Bay, and it is the first step that leads — possibly years from now — to a military trial.

President Obama's voter-approval ratings certainly have been far from spectacular for much of his presidency, remaining mostly below 50 percent since November of 2009.

But on that dimension he may actually be doing better than it appears, at least based on some statistical modeling of presidential approval ratings conducted by George Washington University political scientist John Sides.

Forty years ago, only 1 in 3 American workers was a woman. Today, it's 1 in 2.

You know this already. But it raises interesting, subtler questions: What jobs did all those women get? And how did the gender breakdown change by industry over the past 40 years?

This graph answers those questions.

It shows how the gender breakdown changed in major sectors of the economy between 1972 and 2012.

The size of the circles shows how some sectors grew to include a larger share of the workforce, while others shrank in relative terms.

Two main themes jump out here.

If you thought the presidential primaries were extraordinarily negative, now there's statistical evidence that you were right.

A new analysis of TV ads finds that 70 percent of the messages were negative — a trend spearheaded by the heavily financed superPACs supporting the candidates. At this point in the 2008 election, 91 percent of TV ads were positive.

A small-town mayor in Utah is trying to make congressional history.

Daniel Chong, a California college senior, was forgotten in a federal holding cell without food or water for five days.

Today, he told All Things Considered's Audie Cornish that the five days tested his sanity and his resolve to live.

"I didn't stay sane," Chong said. "Eventually, by the second or third night ... I went completely insane and was just trying to get a grip on reality, on what's happening to me."

Chong said at one point he thought about using his glasses to cut into his arm and kill himself.

Update at 4:39 p.m. ET. $28 To $35:

The AP reports that Facebook has set a price range for its initial public offering between $28 and $35.

The AP adds:

"At the high end, this could raise as much as $11.8 billion. That's much higher than any other Internet IPO in the past, even Google Inc. in 2004."

Artist Candy Chang turned the wall of an abandoned house in New Orleans into "a giant chalkboard where residents can write on the wall and remember what is important to them."

And since putting up that public art project in February 2011, "Before I Die" walls have spread to at least 19 cities around the world. Friday, a wall goes up in Denver.

Democrats keep getting dinged by media fact checkers for attacking Republicans for allegedly wanting to strip money from preventive health programs to pay for to keep the interest rates on some student loans from doubling this summer.

But that hasn't stopped progressives from continuing to make the claim. The latest comes in a new full-page MoveOn.org ad in Politico. The ad reads in part:

College seniors graduating in 2012 face a sluggish economy, bleak job prospects and a mountain of student loan debt. To make matters worse, many don't have the first clue about how to manage their personal finances.

Author Zac Bissonnette, a recent college graduate himself, learned how to handle money by watching his parents' mistakes and ignoring most of their advice. He put himself through college without loans, scholarships or help from his parents.

Can a helmet protect you in a tornado?

The Centers for Disease Control and Prevention says there's no research on how effective helmets are in preventing head injuries during tornadoes.

But, in what looks like a first, the agency says, in effect, that it's not out of the question that they might help.

Last year, tornadoes claimed the lives of more than 500 people in the U.S. Some safety advocates say protecting your head with a sturdy helmet could help reduce injuries and deaths.

Syrian security forces stormed Aleppo University today, killing at least four. The incident underlines the continued violence in the country and signals that the unrest is spreading to cities that had remained peaceful.

Reuters reports that security personelle were joined by students wielding knives to attack a protest calling for the ouster of President Bashar Assad. Reuters reports:

Documents found at Osama bin Laden's compound in Pakistan reveal an al-Qaida leader who had come to feel marginalized and frustrated with actions taken by affiliated terror groups he had helped inspire.

The man responsible for the 9/11 terror attacks is seen struggling to limit attacks that killed mostly Muslims, and to keep the international jihad movement focused on what he viewed as the main target: the United States.

Before his escape from house arrest, his stay at the U.S. embassy in Beijing and now his plea that he be allowed to go to the U.S., Chinese legal activist Chen Guangcheng was the focus of a "Dark Glasses" campaign aimed at drawing attention to his plight.

On May Day, the Occupy Wall Street movement re-emerged to try to reestablish its message and place in the national conversation. Thousands marched in New York City, Oakland and other cities, then quickly faded from national view. Guests consider what sustains social movements, and why some fail.

Men dealing with male pattern baldness have decisions to make — go with a comb over, take medication, get hair plugs or a toupee, or do nothing at all.

When New York Times contributing editor Daniel Jones started losing his hair, he chose what he considers a "cooler alternative" — head shaving.

"Losing your hair," he tells NPR's Neal Conan, "is a little bit like a girlfriend who's sort of drifting away, and you're clinging to her as she goes off and sees other people. ... It gets worse and worse. So it's better to take some sort of pre-emptive move."

Google may be facing new investigations into its Street View program, which collected 600 gigabytes of personal data including e-mails, passwords, pictures and web searches while its vehicles roamed the streets.