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A computer illustration of a large asteroid colliding with Earth. (Size may not be to scale.) Such an impact is believed to have led to the death of the dinosaurs some 66 million years ago.

Scientists Say Dinosaur-Killing Asteroid Made Earth's Surface Act Like Liquid

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 'Scorcher': 2015 Shatters Record As Warmest Year, NASA And NOAA Say

The Northern Hemisphere saw the biggest rise in land temperatures, finishing 2.59 degrees Fahrenheit hotter than the 20th century average.

President Obama drinks a glass of filtered Flint water during a meeting with federal officials at the Food Bank of Eastern Michigan in Flint, Mich., on Wednesday.

'I've Got Your Back,' Obama Tells Residents Of Flint, Mich., Amid Water Crisis

The president told an energetic audience he "will not rest" until the city's water is safe to drink. A federal state of emergency has been declared as a result of lead leaching into Flint's water.

Frigatebirds have to find ways to stay aloft because they can't land on the water. This bird was flying between the Galapagos islands of Santiago and Bartolome.

Nonstop Flight: How The Frigatebird Can Soar For Weeks Without Stopping

Scientists have been attaching transmitters on the huge seagoing birds and are astonished by their ability to stay aloft.

In Wake Of Attempted Coup, Turkish President Vows To Eradicate 'Virus'

A wide crackdown is underway in Turkey following a failed coup against elected President Recep Tayyip Erdogan. NPR's Leila Fadel gives the latest.

USA Football says it will be testing a new version of the game in select youth programs this fall that could become an alternative to tackle football and flag football.

Big Rule Changes Could Make Youth Football Games A Whole Lot Smaller

A modified version of the sport, billed as a bridge between tackle and flag football, will be piloted with select youth football programs this fall. It features fewer players and a shorter field.

President-elect Donald Trump waits to step out onto the portico at the West Front of the U.S. Capitol for his inauguration.

The Trump Foreign Policy Doctrine — In 3 Points

When the clock struck noon, the White House website switched over to signify Donald Trump becoming the new president. And on that site, Trump laid out how he would approach the world.

A man carries a cardboard cutout of Hillary Clinton in Des Moines, Iowa. Clinton and other traditional candidates have struggled to breakthrough as outsiders have captured the attention this summer.

It's Been A Bad Summer For The Political Establishment

The biggest conventional names in American politics — Clinton and Bush — have stumbled this summer as Americans look to channel their frustrations through unconventional outsiders.

Rio's Opening Ceremony Aims To Cast Troubled Games In New Light

The troubled Olympic Games in Rio de Janeiro will have their opening ceremony on Friday. We get a sneak preview of how the country will be showcasing its unique culture and heritage.

Darvin Bentlage is a fourth-generation farmer from Golden City, Mo. He was uninsured before the ACA and featured in a video from the Department of Health and Human Services supporting the law.

Medical Bills Once Made Him Refinance The Farm. Could It Happen Again?

Barton County, Mo. is Trump country. And this rural area also has big problems when it comes to health care. One farmer says he has a lot to lose under the Republican replacement plan.

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