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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.

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.

Villanova and Kansas, both top seeds, will face each other while No. 11 Loyola-Chicago will play No. 3 Michigan on Saturday in the semifinals in San Antonio, Texas.

The Philadelphia Eagles won the Super Bowl for the first time in history on Sunday. NPR's Gene Demby is from Philadelphia, and talks about what the win means for the city and for him.

House Minority Leader Nancy Pelosi said the first order of business will be a vote on campaign finance reform. House committees also will launch investigations of Trump administration officials.

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.