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AUDIE CORNISH, HOST:

New research out today indicates that a popular medical test may increase the risk for some forms of cancer. A large international study found that CAT scans, which are also known as CT scans, can increase the risk for leukemia and brain cancer in children.

NPR's Rob Stein joins us now to talk about the new findings. And, Rob, I understand the concerns about these scans have been building for a long time. So what's the specific source of worry here?

$400 million in damage to the Navy's fast attack submarine USS Miami was caused by a fire started by a vacuum cleaner.

That's what a preliminary report about the May 23 fire has found. The vacuum cleaner, the Navy said in a statement, was "used to clean worksites at end of shifts, and stored in an unoccupied space."

There's still no indication how the vacuum cleaner caught fire to begin with.

Republican Gov. Scott Walker triumphantly returned to the Wisconsin Capitol Wednesday, fresh off of his decisive victory in Tuesday's bitter recall election.

The governor appears to be emerging from the tough recall fight stronger, and with his national profile rising.

Barely a day after she competed in the Miss USA beauty contest, Miss Pennsylvania Sheena Monnin tore off her sash and fired a scorching resignation:

"In good conscience I can no longer be affiliated in any way with an organization I consider to be fraudulent, lacking in morals, inconsistent, and in many ways trashy."

Trashy? There's a surprising perjorative from a woman who says on Facebook she's spent a decade associated with the pageant.