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About 6 million years ago, a new mineral analysis suggests, a mighty river zigzagging across the Colorado plateau may have found its way into older gorges, greatly enlarging them to create the West's most spectacular canyon. Still, some geologists aren't sold.

In a series of marches that began in 1864, the U.S. Army forced thousands of Navajo and Mescalero Apache people to walk 400 miles to an isolated reservation; more than a third died. Some say today's ills in Indian Country — severe poverty, suicide, addiction — have their roots in the "Long Walk."

Federal Reserve Chairman Ben Bernanke will preside over his last Fed policy-making meeting on Tuesday and Wednesday. During his two terms as chairman, he faced a global financial crisis that threatened to become financial Armageddon, followed by a deep recession.

The third anniversary of Egypt's revolution was marked with violent clashes across the country between pro and anti-government demonstrators. By Sunday morning at least 49 people had been killed and more than 1,000 arrested.

Another wave of brutally cold air is sweeping down from the Arctic across much of the nation. Meanwhile, in many places in Alaska the temperature has been popping up above freezing. That pattern's likely to continue into February.

The offer comes after anti-government demonstrations spread to cities where the citizens have shown support for the president. Meanwhile, the nation's justice minister has warned she may declare a "state of emergency" unless protesters leave her headquarters.

Numbers don't lie, but they can sometimes tell a misleading story. Three times in the past week, we came across farm statistics that painted a picture not quite backed up by facts on the ground.

The late pope often rested in the mountains of Italy's Abruzzo region, and worshiped at a small church there. A small relic containing a piece of gauze that had been soaked in his blood is now missing.

Many women don't know when they're most likely to get pregnant each month, and some think certain positions will boost the odds, a survey finds. There are also big gaps in knowledge about risk factors for infertility and birth defects.

According to leaked secret documents, the NSA can scoop up deeply personal data from mobile phone apps. The spy agency also exploits innocuous actions like updating a phone's software.