Life's Little Mysteries

Tyrannosaurus rex and many of its theropod cousins had large bodies but tiny arms. What gives?

"Dunbar's number" implies that our relationship threshold is limited to 150 people. But is this true?

Shedding fur is useful for cats and dogs. Here's why they do it.

Here's what made the "man in the moon" and why these "facial" geological features are here to stay.

Here are the measurements for the deepest depths in each of the world's five oceans, and a look at the unique animals that live in these deep zones.

Space weather has been known to cause power outages and disrupt satellite function. Is the internet safe?

Mother cats nurse kittens, but can older cats safely lap up milk?

Is there a way to suppress unwanted thoughts that repeatedly pop into your mind?

What's the fastest an airborne animal can go?

The largest head in the animal kingdom likely belongs to the blue whale, while the largest relative to body size comes from an unlikely source.

The vast Roman Empire split into the Eastern Roman Empire and Western Roman Empire in the fourth century A.D.

The big stars make our sun look puny.

Black holes go boom in several ways.

With climate change, habitat loss, overhunting and more, which animals are at risk of extinction by 2050?

Although it's now familiar as candy, the origins of chocolate are much deeper.

Organisms that reproduce quickly can quickly evolve into new species, while geographic barriers can lead to new species formation over tens of millions of years.

There are a few contenders for the world's oldest known civilization.

Our brains don't get a break while we sleep. What happens to this major organ while we snooze?

A well-known expression says that Nero fiddled while Rome burned. But has history misrepresented this infamous ruler?