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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.

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.

Dumplings are a huge part of Chinese culinary tradition, and restaurants there cater to the nation's obsession with a dazzlingly array of dumpling shapes and fillings, including green frogs stuffed with bullfrog meat and a flock of birds filled with roasted Beijing duck.

Biden's pick to be the Fed's top bank regulator has withdrawn her nomination. She attracted Republican opposition after calling on bank regulators to monitor the financial risks from climate change.

Twitter has struggled to attract new users. Its latest effort at rejuvenation is a new kind of timeline that predicts which older posts you might not want to miss and displays them on top.

For many students, Saturday was their first demonstration for a cause. They bundled in the U.S. capital, delivering a defiant message: stricter gun regulation. NPR photographers captured the scene.