Life's Little Mysteries

It's impossible to know for sure the deadliest day in U.S. history because you can end up comparing apples with oranges.

Here's how we might stop the flow of time.

Latin is alive and well, but Julius Caesar might struggle to understand its modern form.

Here's why mosquitoes buzz around our heads ... and our feet.

Biologists recently caught a 7-foot-long sturgeon in the U.S. but there are much bigger fish lurking in Earth's rivers. What's the biggest freshwater fish in the world?

Comfort, consolation and conflict avoidance are just some of the reasons animals embrace.

Why aren't humans covered in dark, scruffy body hair, like apes are?

It's overwhelmingly genes, but DNA alone can't make you tall.

Goldfishes actually have memories that can last for weeks, months and even years.

During the so-called Super Flower Blood Moon lunar eclipse, the face of the moon will turn a brick-red hue. Here's why.

Human laughter may trace its evolutionary beginnings to vocalizations made during play. This type of "laughing" is found in many mammals and even in some birds.

Why do people still use the King James Bible, which was translated in the early 1600s?

Ancient text on papyri is shedding light on the lives of the pyramid builders.

R.E.M. wasn't singing about backaches or sprained ankles.

Humans may be heart-attack-prone because of a mutation that keeps us from making a particular sugar molecule.

Will it help if you've trained at the North Pole?

There are many ways the world could end, from all-out nuclear war to a giant asteroid strike. How many people would need to survive such an apocalypse for humans to avoid extinction?

From what it stands for, to how it's celebrated, here are a few fun facts about the Mexican holiday Cinco de Mayo.

Even if they don't get moldy, nuts and grains can go bad. Why is that?