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As the number of new Facebook users plateaus, the company will have to find ways to draw individual users in for longer periods of time if it hopes to keep ad profits growing.

An IPO filing provides a window into wealth. In the case of Facebook, the wealth will likely be enormous and spread across hundreds if not thousands of early investors and employees. The number of millionaires and billionaires in Silicon Valley grew noticeably Wednesday.

A study of cocaine addicts finds that they have abnormalities in areas of the brain involved in self-control. And these abnormalities appear to predate any drug abuse.

Republican strategists say it's not clear yet whether the primary battle will help or hurt Mitt Romney if he becomes the nominee. He emerged from his win in Florida with both his strengths and his weaknesses on display. Plus, some Republicans worry that the race's negative tone will turn off voters.

Police have apprehended a man accused of stealing five tons of ice from a glacier in Chile. The Guardian reports police nabbed him with the illicit ice in his refrigerated truck. They believe he planned to sell it as designer ice cubes to the trendy bars of Santiago.

Some believe America is in decline. But author Robert Kagan disagrees. He talks to Steve Inskeep about his new book The World America Made." President Obama recently discussed an article Kagan wrote for The New Republic called "The Myth of American Decline."

The New York Giants face the New England Patriots in the NFL Super Bowl XLVI on Sunday. In 2008, the underdog Giants beat the Patriots 17-14. NPRs Mike Pesca preview's the nation's biggest sporting event and talks about what to expect from the 2012 rematch.

The once-booming clean-tech industry is facing hard times, in part because of cheaper natural gas, the effects of the financial crisis, China's growing solar industry and the Solyndra bankruptcy. Reporter Juliet Eilperin, who covers the industry's struggles in Wired's February issue, explains.

Though Prime Minister Vladimir Putin's United Russia party lost dozens of seats in Russia's parliament, he's still considered a sure-thing in the March presidential election, analysts say. But now he may have to work with other parties.

Russia's ruling political party fared worse than expected in a parliamentary election Sunday. The vote is being viewed as a setback for Prime Minister Vladimir Putin's United Russia party, which retained power but has a weaker majority in Parliament. For more on the election, Steve Inskeep speaks with Masha Lipman, an analyst at the Carnegie Moscow Center.