Harvard researchers say a comet from deep space — not an asteroid from the belt past Mars — was responsible for the mass extinction. Others are skeptical.

It's easy to see why sloths have become icons of laziness. But zoologist Lucy Cooke says behind their leisurely pace is a marvelous evolutionary advantage that is the secret to their survival.

A pharmacist in Grafton, Wisc., is accused of tampering with supplies of the Moderna vaccine in December. He faces a maximum of 10 years in prison and a $250,000 fine for each of two charges.

A new study investigates whether common ownership of cereal makers by institutional investors is leading them to become a kind of stealth monopoly.

The California man was arrested Saturday on felony trespassing charges, prosecutors say. He apparently had obtained airport credentials and survived on food from strangers.

A new study looks at ways to make New Year's resolutions succeed.

Researchers discovered that an octopus might punch a fish when both are hunting. Although some of the thrown punches can be explained, others remain a mystery.

The incident captured the attention of many as authorities sought to save the boy, thought to be stuck in an airborne weather balloon. Later, authorities called the situation a hoax.

All year, cleaning products have been flying off the shelves — now, they're flying straight into Christmas stockings and wrapping paper.

In a virtual town hall for kids on CNN, Dr. Anthony Fauci said he made a trip to the North Pole to get Santa vaccinated for COVID-19. "He is good to go."

The official moniker, announced by Vice President Pence at a White House ceremony, comes one year after the creation of the newest military branch. The name drew raised eyebrows online.

The Trump Plaza in Atlantic City, N.J., is scheduled for implosion next month, but the right to press the button is still up for grabs. The city is auctioning off the opportunity for charity.

The grandson of Forrest Fenn, who hid the trove that set off a hunt for buried treasure, confirmed that it was found by a man named Jack Stuef. Stuef says a lawsuit forced him to come forward.

Luckily, the man in the cockpit of the single-engine plane Wednesday night happened to be an experienced aerobatic pilot, whose maneuvers impressed even the state's Department of Transportation.

For the third time in three weeks, a metal monolith has appeared without explanation, this time in Central California. Yet answers are just as scarce as when authorities found the first one in Utah.