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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.

Defense Secretary Donald Rumsfeld announces a reduction in the number of U.S. troops in Iraq. Rumsfeld said the number of U.S. combat brigades in Iraq will be cut to 15 from 17. The top ground commander in Iraq, Gen. George Casey, also said he could advise further cuts in troop levels by spring.

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.

The Los Alamos National Laboratory in New Mexico places 15 employees on mandatory leave as the FBI investigates the disappearance of two data storage devices containing classified information. The incident raises questions over the balance between protecting top secret research at the nuclear weapons lab and scientists who value working unhindered by elaborate security measures. NPR's David Kestenbaum reports.

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.

Searches for 'dating apps for older people," "top dating apps 2021," and "virtual first date ideas" have also all seen a significant spike.

"I really love it," Jolien Boumkwo said as her unusual turn in the 100-meter hurdles created a sensation.