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A new look at the "Dueling Dinosaurs" fossil reveals that Tyrannosaurus rex was not the only tyrannosaur roaming western North America during the late Cretaceous period.

The former House speaker began his career as a history professor at West Georgia College. "He thought he could have some kind of impact, to get kids to think," says a friend and former colleague. "But he really wanted to get into politics."

A ship full of researchers is crossing the Arctic attached to an ice floe. But finding the right chunk of sea ice was a challenge, in part because warmer temperatures are making it thinner.

By Katie Knapp SchubertOmaha, NE – The Missouri River is expected to rise two feet between now and Friday at Omaha.Omaha's Missouri River Unified Command…

A graduate student working on a class project spotted the coils, which hint that Mars had recent volcanic activity.

Also: Inflation remains in check; mayor of Newark, N.J., helps evacuate burning home; Obama sticks up for Ann Romney.

The owner of the Nutshell Pub asked customer Adam Thurkette if he'd mind staying away during busy hours. Adam is 6 foot 7. And the Nutshell is reportedly Britain's smallest pub — 15 feet by 7 feet. The owner says Adam takes up too much room.

Residents of Pakistan's Himalayan region turn to science and folklore, with backing from the U.N. They're erecting ice towers, harvesting avalanches and performing an ancient glacier ritual.

Well-known artists and designers are taking over billboards (donated gratis) to brighten the landscape in an emptier-than-usual Times Square. One work simply reads: "Hopefully no one will see this."

From the U.K. to Kenya to the West Bank, photographer James Mollison exposes not only inequalities among rich and poor countries, but also the intimate moments that unfold during recess.