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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.

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.

McDonald's is trying to hold down menu prices and keep options simple to speed up service while at the same time create pricier premium burgers and more sophisticated dining options.

The top prosecutors in Cuyahoga County, Ohio, and Cook County, Ill., were voted out in primaries Tuesday. Both have been under fire for their handling of fatal shootings by police.

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.

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.