National and World News from NPR

On July 1, the European Union says it will stop buying oil from Iran. Europe is one of the most important markets for Iran's oil, and in anticipation of the boycott, Iranian oil exports worldwide are already down by more than 25 percent.

Iran's leaders say they can weather this pressure, and so far they have refused to budge on their controversial nuclear activities, ones that prompted a series of economic sanctions.

As a result, it appears as if Iran will only face even greater difficulties when it comes to exporting oil, the lifeblood of its economy.

The year began with New Year's resolutions to get fit and ever since, Morning Edition has been talking to athletes, musicians, a mail carrier and the head of the IRS about the music that gets them moving. The Ultimate NPR Workout Mix series concludes with a contribution from Michelle Obama.

The first lady is the mover and shaker behind "Let's Move," a campaign designed to get young people, in particular, to eat better and exercise more.

During a recent tour of the White House vegetable garden, Obama shared the key to her workout routine.

Imagine a school where every child gets instant, personalized writing help for a fraction of the cost of hiring a human teacher — and where a computer, not a person, grades a student's essays.

It's not so far-fetched. Some schools around the country are already using computer programs to help teach students to write.

There are two big arguments for automated essay scoring: lower expenses and better test grading. Using computers instead of humans would certainly be cheaper, but not everyone agrees on argument No. 2.

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.

Transcript

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?