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A new study suggests that there's a slight increase in the risk of brain cancer and leukemia associated with CT scans for children. Experts say, in most cases, the risk doesn't not outweigh the benefit of the CT scan, but call on doctors to be more selective in ordering them. Audie Cornish talks to NPR's Rob Stein about the study.

CT scans provide exquisite pictures of what's happening inside the body, but they use a lot more radiation than standard X-rays. A British study details the future cancer risks from CT scans of children.

Some schools, looking to cut costs, are intrigued by so-called robo-readers, computer programs that grade students' writing and offer feedback. Some teachers find the programs helpful in the classroom, but skeptics say they're not always the best judge of writing ability.

Scott O'Neill's big idea to rid the world of dengue is both clever and complex: He wants to infect mosquitoes with bacteria so they can't carry the virus that causes the disease. But, it turns out sticking mosquito eggs with a needle full of bacteria isn't easy. "It's incredibly frustrating work," he says.

When you're the first lady, squeezing in a workout between briefings and state dinners can be tricky. Obama says that when she's selecting her exercise music, variety is key.

Science fiction writer Ray Bradbury died Tuesday at the age of 91. Among other things, he wrote The Martian Chronicles and Fahrenheit 451. Commentator Andrew Chaikin talks about the influence Bradbury had on science and the space program.

Following last year's revolution in Tunisia, moderate Islamists now head the government in Tunis. While many Tunisians say hard-line Islamists threaten the country's nascent democracy, others worry the economy is being ignored.

Google has announced new features in its mapping service such as 3D and offline maps. The unveiling came just days before Apple is expected to announce its own mapping software.

Perched on his homemade bike, Felix Guirola rides around Havana. The bike is so tall; he can peer over buses and second-story windows. Hanging traffic lights do pose a problem.

The defense secretary expresses frustration with terrorists' ability to attack U.S. forces in Afghanistan because they have safe havens in Pakistan.