We can answer this question by looking at the differences between the first, second and third layers of our skin.
You've had your own personal set of fingerprints since before you were born, and they'll be with you throughout your whole life.
Atmospheres can be all different colours, depending on what's in them.
Languages are always changing and evolving- largely because humans have alwasy been on the move.
Spit, drool, dribble, slaver, slobber or sputum – saliva has many different names. It also has many different jobs.
Authors sometimes put deeper meanings into their stories, but really, it's the reader who decides.
The sound comes from our lungs and our voice box, which is at the front of the throat. Here's how it works.
We're not sure how the rings work or how they formed, but there are a few theories.
Researchers are puzzled by a fungus that is killing millions of bats.
Since caffeine is in so many different foods and drinks, it's easy for kids – or grownups – to get more than they should without realizing it.
An expert explains the challenges of a mission to Mars for younger readers.
Short answer: they don't. But striking teachers often receive a bit of financial help during a strike from money they themselves have already paid to their unions.
Like many plants, onions have defenses to ward off creatures that may want to eat them. Their secret weapon is a kind of natural tear gas.
When you read in the back seat of the car, your eyes tell your brain you're still. But your ears can sense you're moving. Your eyes and ears are having an argument that your brain is trying to settle.
The Babylonians' calendar was passed down from civilization to civilization.
Magpies have such good hearing, they can hear the very faint sound of grass roots being chewed.
If you've ever spent even a few minutes with children, you've probably heard them ask a question or two. Or many more. Here are answers to a handful.
Sand may seem abundant when your toes are buried in it, but it's becoming scarce along many coastlines around the world.
What is the climate emergency, and whose climate crisis is it anyway?
If you're thinking about a smartphone, talk with your parents.