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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.

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.

Life Expectancy In U.S. Drops For First Time In Decades, Report Finds

Overall, U.S. life expectancy dipped in 2015 — the first drop since 1993. That's because the death rate went up between 2014 and 2015, driven by an increase in mortality among people younger than 65.

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.

High School Students Break Down The Super Bowl Ads

A New York City-based program aims to make students into critical media consumers.

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.

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