Life's Little Mysteries: Science questions, answered

Viruses and bacteria have been around for billions of years, but which came first?

Celine Dion sings that "my heart will go on," but how many times does it actually beat in a day or even a lifetime?

The biological needs of plants and animals affect their cells' protein content, but the story goes deeper than that.

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?