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Children who get CT scans are at slightly increased risk for brain cancer and leukemia, according to a large international study released Tuesday.

CT scans create detailed images of the inside of the body. So they're great for diagnosing all sorts of medical problems — so great that their use has soared in recent years. More than 80 million are being done every year in the United States.

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DAVID GREENE, HOST:

Some sad news this morning: The world has lost a literary giant. Author Ray Bradbury died last night after a long illness. He was 91 years old. He wrote such classics as "The Martian Chronicles" and "Fahrenheit 451" - futuristic tales from a man who never used a computer, or even drove a car. NPR's Arnie Seipel has more on Bradbury and his curious life.

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RENEE MONTAGNE, HOST:

Good morning. I'm Renee Montagne. Eight thousand people will carry the Olympic torch before it reaches London to open the summer games, though one would-be torch barer isn't even human. He's a small red fuzzy monster.

KEVIN CLASH: (As Elmo) Elmo's ready to start training to be a monster torch-bearer. Yay. Oh, oh, Cramp, cramp.

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DAVID GREENE, HOST: