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NEAL CONAN, HOST:

Murray, we're just hearing that film critic Roger Ebert has died. The Chicago Sun Times, Ebert's paper, tweeted the news a few moments ago. Ebert, of course, an icon of film criticism, a one-time filmmaker himself, best known perhaps for his days on TV with fellow critic Gene Siskel. Their thumbs up or thumbs down rating system now a de facto review method of critics and filmgoers alike.

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NEAL CONAN, HOST:

This is TALK OF THE NATION. I'm Neal Conan in Washington. Some of you are sitting in traffic right now, muttering darkly about how it's possible to hit every single red light. Los Angeles, a city that suffers more congestion than most, tried to unclog traffic for years by synchronizing its lights. Earlier this year, it became the first major city to tie all its traffic lights to a computerized system that uses motion sensors and cameras to monitor flows of traffic. They report modest improvements, but do drivers notice any change?

Scientists say they have found a way to get a glimpse of people's dreams.

"Our results show that we can predict what a person's seeing during dreams," says Yukiyasu Kamitani, a researcher at the ATR Computational Neuroscience Laboratories in Kyoto, Japan.

Philosophers, poets and psychologists have long shared a fascination with dreams. But Jack Gallant, a neuroscientist at the University of California, Berkeley says solving the mystery of our dreams is one tough problem.

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NEAL CONAN, HOST:

Like a lot of new movies, "Oz: The Great and Powerful" skips down some familiar pathways. Twenty years before Dorothy, Toto and friends followed the yellow brick road and a couple of witches consider the arrival of one Oscar Diggs who fancies himself a wizard.

(SOUNDBITE OF MOVIE, "OZ THE GREAT AND POWERFUL")

MILA KUNIS: (as Theodora) I simply want peace. That's all I ever wanted and the wizard can do that. He's a good man.

RACHEL WEISZ: (as Evanora) What do you know about goodness? Deep down you are wicked.