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Despite missteps on the campaign trail, former Vice President Joe Biden continues to retain support among key Democratic voter groups, but Bernie Sanders and Elizabeth Warren aren't far behind.

Jeff Hawkins created the PalmPilot and Treo smart phone. His new company, Numenta, is developing a type of computer memory system modeled after the human neocortex, what he calls the "the big wrinkly thing" at the top of the brain. He's also the co-author of the book On Intelligence, which details his vision of how the brain processes information.

The former southern African breadbasket of Zimbabwe is in the midst of an economic and social meltdown. Zimbabwe's annual inflation tops 1,000 percent, the highest in the world. The country's economy has shrunk by almost a third since 2000. And there are regular shortages of everything from gasoline to basic food staples.

I. Lewis Libby, Vice President Dick Cheney's former top aide, pleads not guilty to charges against him in a case probing who revealed the identity of a covert CIA agent. He was arraigned in federal court in Washington, D.C., on charges of obstructing justice, perjury and making false statements.

Media watchers say recent book and film trends suggest a "perfect storm" of politically motivated popular culture, which has been building for years. Books from the left and right top best-seller lists, while films like Fahrenheit 9/11 draw box-office crowds. Hear NPR's Lynn Neary.

Right at the top of a list of the country's most endangered rivers is New Mexico's Santa Fe. The American Rivers group says the river must be cleaned up — and it shouldn't be siphoned off for other purposes, either.

A year ago, Karen Schock's farm was mostly under water in southeastern Iowa; she could barely see the top of her windmill. Guy Raz checks back in with Schock, who, with her husband Bill, is still farming, bolstered by the support of their church community.

As Otto Perez Molina takes office Saturday, one of his top priorities is regaining U.S. military aid, which the U.S. banned because of alleged abuses during Guatemala's civil war. Experts say exactly how Perez will tackle the current wave of violence — or if his approach is effective — remains to be seen.

Reporter's Notebook: Back from election coverage in Florida, NPR photographer Becky Lettenberger shares her thoughts.

Most Super Bowl advertisers tried to crack up the TV audience with over-the-top antics, as is to be expected in the highly viewed event. But some of this year's best ads, as judged by experts and viewers, took a more somber tone.