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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.

The former southern African breadbasket of Zimbabwe is in the midst of an economic and social meltdown. Zimbabwe's annual inflation tops 1,000 percent, the highest in the world. The country's economy has shrunk by almost a third since 2000. And there are regular shortages of everything from gasoline to basic food staples.

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.

After 19 seasons in the NBA, Carmelo Anthony retires as the 9th top scorer in the league's history, and holds 3 Olympic gold medals.

Almost all cable subscribers pay to rent a set-top box netting the industry billions a year. Chairman Tom Wheeler says ending that practice would lead to more innovation in the way we consume TV.

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.

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.