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The federal government has begun tallying the damage climate change could do to the economy and its budget. This comes as scientists warn time is running out to avoid catastrophic global warming.

A Harvard dental researcher says he's figured out the purpose of the giant, unicorn-like tusk seen on narwhal whales: It acts like an antenna that allows the narwhal to sense food and sea conditions. The dentist says the tusks are a giant tooth that grows inside out, with hard tissue inside and sensitive nerves on the outside.

The Indonesian resort island of Bali is still reeling from the second major terrorist attack in three years. The death toll is at 26, with more than 100 wounded. In 2002, blasts blamed on the Islamic militant group Jamaah Islamiyah took 202 lives.

After last summer's devastating hurricanes, emergency relief for the Gulf Coast's seafood industry has been slow. The appropriations are still held up by Congress, and the industry hasn't seen a penny of federal money for industry rehabilitation. Mike Voisin, CEO of Motivatit Seafoods in Houma, La., talks with Liane Hansen.

Everyone has heard at one time or another about the old myth that if you dug a hole deep enough, you'd end up on the other side of the Earth, in China. As it turns out, the undertaking is much more complex than it might seem.

As Russia invades Ukraine, some cyber experts warned of an initial, crippling cyberattack. That hasn't happened yet. But the digital threat has been present in more subtle ways.

This weekend, Hollywood's biggest movie release is set in 10,000 BC. But two other "period" movies — The Bank Job and Miss Pettigrew Lives for a Day — prove more interesting. Both play with movie styles that have mostly gone out of fashion.

Car enthusiasts are trekking across the U.S. this year along Lincoln Highway. The transcontinental trips are part of centennial activities for the road known as "The Main Street Across America," and a unique group of tourists started their journey all the way in Norway.

Japan's expected release of radioactive water from a damaged nuclear plant has alarmed South Korea, possibly jeopardizing a fragile rapprochement between the two neighbors and U.S. allies.

Sharks are ectotherms and their internal body temperatures usually reflect the waters they swim in. Holding their breath helps them function in the frigid deep.