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.

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."

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.

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.