Life's Little Mysteries: Science questions, answered

Some cats chatter, oftentimes when they see prey. But why?

The moon's distance from Earth changes depending on where it is in its elliptical orbit.

Drinking water triggers a variety of complex biochemical reactions that reward rehydration and help satiate our thirst.

We don't know when the last Neanderthal died, but many archaeologists think some of the last lineages lived in southern Iberia.

Earth is round, but are there any planets in the universe that aren't?

How many offspring an animal can have depends on many factors, such as whether they're aquatic and how they get around.

We all hold in farts from time to time, but where does the gas go?

The human body has a number of mechanisms that prevent you from holding your breath until you suffocate.

Being a Roman gladiator was a bloody business, but did all gladiators really fight to the death?

No one knows for sure when steel was invented, but some of the earliest examples crop up in the first millennium B.C. in Central and South Asia.