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Use of CT scans in the U.S. has more than tripled in less than two decades. Despite the medical benefits, these scans emit a significant amount of radiation. A new study estimates that 29,000 future cancers could be related to CT scans performed in the U.S. in 2007.

Use of CT scans in the U.S. has more than tripled in less than two decades. Despite the medical benefits, these scans emit a significant amount of radiation. A new study estimates that 29,000 future cancers could be related to CT scans performed in the U.S. in 2007.

Climate scientists say Colombia's glaciers could disappear within 15 years. Wet highland areas that provide much of the country's fresh water are getting warmer and drier. And each year, flooding becomes more severe. The coastal area of Tumaco has become an example of how environmental and security pressures are undermining previously stable communities.

The Bauhaus was one of the most important and exciting social and artistic movements of post-World-War-I Germany. Founded by architect Walter Gropius, the movement lasted 14 years until the Nazis finally forced it to shut down. An astonishing exhibition at the Museum of Modern Art gives a thorough view of the precise but imaginative products of Bauhaus.

Pilot Chesley Sullenberger's wild ride started this year when he landed a US Airways jet plop-solid perfect onto the icy surface of the Hudson River on Jan. 15, saving all 155 passengers on board. He's a hero to the nation, but Sullenberger says his story is really more about a nation in need of a hero.

The author talks about her blockbuster novel, The Lovely Bones, which features a surprising device: its main character, a young girl who has been murdered, narrates the book from the afterlife. Sebold's book is the basis for a new film by director Peter Jackson.

During his decade as director of the Metropolitan Museum of Art, Thomas Hoving is credited with transforming the museum from a somber monolith into a friendly and exciting place. Hoving died Thursday of cancer at his Manhattan home, according to his family. He was 78.

India is the planet's fifth biggest carbon polluter. Even with its vast population, its per capita emissions are many times lower than the West. As India's economy grows, so will its pollution. India's government has announced measures to combat climate change. But some question whether it can carry them out. The city of Gurgaon has become the front-line in a battle between government and growth.

Every Christmas, Santa Claus uses advanced technology to accomplish his seemingly impossible duties. In the new book The Truth about Santa, science writer Gregory Mone explains.

Romanian novelist Herta Mueller was awarded the 2009 literature prize for her depictions of "the landscape of the dispossessed." Her first novel, Nadirs, has just been reissued. Critic Alan Cheuse has a review.