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The asteroid smashed into Earth. And from miles under the Earth's surface, rock hurtled upward to a height twice that of Mount Everest and then collapsed outward to form a ring of mountains.

A lot of people are going out of their way to avoid gluten. Some have celiac disease, while others have some degree of gluten sensitivity. But the perception that a gluten-free diet is always a healthful diet isn't quite accurate.

The price of gas keeps rising for Americans, but it's not because of rising demand from consumers. In fact, demand has fallen since 2007. Consumers' craving for hybrids and aversion to paying more at the pump are only part of the story.

The Sweet Sixteen is set in the NCAA men's basketball tournament, and there are few surprises: All but two teams are from power conferences.

The Iowa caucuses ended with Mitt Romney's extremely narrow victory over Rick Santorum early Wednesday morning. The first presidential nominating contest of 2012 played out at hundreds of sites across the state. And at the secondary school in Van Meter, voters were packed into the lunch room.

Unmanned aircraft — or drones — are playing a big role in U.S. military operations abroad but they're starting to show up above the U.S. as well. Drones are already being used to patrol the border with Mexico, and now they may soon be coming to your local police department.

An NPR analysis of contributions week by week found that itemized contributions to Texas Gov. Rick Perry dropped 60 percent during the week following his first appearance in a GOP presidential debate, on Sept. 7. That same week, Romney's itemized contributions went up 50 percent. Compare the candidates' weekly fundraising totals in an interactive graphic.

With defense spending taking a hit, contractors are looking for new markets. The Department of Homeland Security is one of the most promising — especially border security. At a recent expo, businesses showed off their goods that might help strengthen America's borders.

The first-ever She The People forum is organized around questions from female voters of color, with 2020 presidential candidates being reminded what a big role they play in the Democratic Party.

Spring brings thousands of seasonal migrant workers to farms across the country, where they usually live in camps with several to a room sleeping in bunk beds. How does that work during a pandemic?