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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.

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.

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.

Echoing comments made Monday by President Obama, Attorney Gen. Eric Holder also said that even if no laws were broken it was "outrageous" for the IRS to focus on groups who identified themselves as "patriots" or "tea party" supporters when they applied for tax-exempt status.

The trial itself will begin on Feb. 9, giving the Democratic House impeachment managers and Trump's defense team two weeks to file briefs and finalize their legal preparations.

Nearly 150 Central America migrants are camped out at the entrance to a U.S. border station in Tijuana, Mexico. U.S. officials say they can only take a limited number of asylum applications.

At first glance, Friday's report on economic growth looked dismal. But most of the GDP trouble centered on weak inventory accumulation this spring. As companies restock this fall, growth may rebound.