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7 Amazing Facts About Human Blood
George Washington died after his physician treated his sore throat with bloodletting, but don't let that stop you from learning more about the human circulatory system....
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14 Facts About Feet
Those 52 foot bones do a lot of heavy lifting....
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Why Do Grown-Ups Have Wrinkles?
As we get older, we lose some of the stuff in our skin that helps it to stretch and then return to its normal place....
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Why Do Dogs Sniff Each Other's Butts?
Chemicals from special glands on a dog's rear end tell other dogs a lot about them. Here's why dogs sniff each other's butts....
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Why Doesn’t the Ocean Freeze?
Actually, it does! You just have to be in a really cold place to see it....
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Why Is Glue Sticky?
Glue is adhesive, which means it is sticky. It also has to be cohesive, meaning it sticks to itself. So how does glue do that?...
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Why Do I Cry?
We are the only creatures on Earth that cry because of our feelings. Here is the reason why we cry....
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Why Are There No More Dinosaurs?
Scientists think a terrible event killed most of the dinosaurs off. But some remain—and they fly....
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Why Do Sour Things Make Me Pucker?
It could be your body's way of saying "watch out!" Here is the reason why sour things make you pucker....
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Why Are Feet So Stinky?
It’s not actually your feet that stink. It's actually the bacteria that lives on your feet that smells....
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Why Does My Heart Beat Faster Sometimes?
Your movements and your feelings can give your heart a little workout. Here is why your heart beats faster sometimes....
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Why Does My Stomach Rumble When I’m Hungry?
A gurgling, rumbling stomach doesn’t always mean that you’re hungry. It just means your digestive system is trying to do its job....
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Why Are There So Many Different Languages?
Human migration played a big role. Here are the reasons why there are so many different languages around the world....
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Why Are the Days Longer in Summer?
Did you know that when it’s summer in North America it is winter in some other continents, like South America and Australia?...
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Why Do Cats Sleep So Much?
Cats spend a lot of time taking short “cat naps” that build their energy, yet keep them alert enough to jump up the moment they sense danger or excitement....
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Why Do Animals Have Whiskers?
From cats and dogs to rats and seals, animals use whiskers to help them find their way and follow their prey....
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Why Are There Shooting Stars?
Have you ever seen a flash of bright light streaking through the night sky? People around the world have different ways of explaining these so-called shooting stars....
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Why Does My Skin Wrinkle in Water?
Have you ever noticed that your fingers and toes get wrinkled when you’ve been soaking in water for a while?...
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Why Do We Laugh?
Scientists don’t yet know all the reasons why so many different things cause us to laugh. But we do know laughter helps us to get along with each other....
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Why Do Astronauts Wear Space Suits?
Space suits don’t just make astronauts look cool. Without these special suits, astronauts wouldn’t be able to leave their spacecraft....
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Why Are Flamingos Pink?
It’s easy to spot flamingos. These amazing birds have long, skinny legs and a long, skinny neck to match....
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Why Do Things Float in Water?
I bet you know that wood floats but a rock sinks. But why? Let’s look deep inside each object at its molecules....
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Why Doesn’t My Bike Tip Over When I’m Riding It?
When people are learning to ride a bike, they often make big, jerky movements with the handlebars wheel and their bodies....
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10 Facts About Being a Climate Scientist—From Climate Scientists
What exactly is a climate scientist, and how do they make sense of the complicated systems that rule our lives on the planet?...
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15 Facts About Maggots
Maggot therapy is making a comeback....
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15 Naturalists Who Died in the Field
Countless scientists, naturalists, conservationists, and support staff have died in the pursuit of knowledge that could protect vulnerable places and species, and enable people to live safer, healthier lives....
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8 Silkily Engineered Facts About Spider Webs
Relative to weight, the strength of a spider web rivals steel and Kevlar, the material used to make bullet-proof vests....
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Why Do I Get Cavities?
Your mouth is a busy place. There are hundreds of different kinds of bacteria living on your teeth, tongue and gums....
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Why Do Lizards Lose Their Tails and Regrow New Ones?
Scientists looking at geckos under a microscope have found out that some parts of the tail are weaker than other parts....
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Why Are There High and Low Tides?
Have you ever been to the beach and built a sand castle, then watched it wash away when the water came in?...
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15 Blissfully Cool Facts About Ice
It's summer. Time to think about the science of the cubes clinking in your drink....
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Why Do I Sometimes Get 'Brain Freeze' From Eating Ice Cream?
Your body and brain are trying to figure out what to do about all that icy cold stuff you just swallowed....
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Why Are Some Farts Noisy?
Farts can make a lot of different noises. Some farts are high and squeaky. Some explode like a machine gun. Some don’t make any noise at all....
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Do Carrots Improve Your Vision? 15 Misconceptions About Your Eyesight
Let's clear up a few things....
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Why Does My Cut Itch?
Your skin protects you by keeping germs out of your body. But when something hard or sharp breaks through your skin, it makes a cut, or a wound....
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Scientists Find New Method to ID the Sex of a Dinosaur
We can thank a pregnant T. rex for the breakthrough....
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Listening to Yourself Eat May Help You Lose Weight
They call it the "Crunch Effect."...
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15 Archaeological Sites Revealed—and Now Threatened—by Climate Change
As quickly as new discoveries are made, they are vulnerable....
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Why Am I Left-Handed?
Only about 10 percent of people are left-handed. If you’re one of them, you're part of a rare and special group....
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Oregano Significantly Curbs the Amount of Methane in Cow Burps
Finally, an herbal remedy we can get behind....
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Where to See the Monarch Butterflies Wintering in California Before They Leave
Thousands of orange and black butterflies are clustering for warmth amidst stunning scenery....
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'Social Robots' May One Day Help Your Doctor
Meet Nadine. She says she's "completely self-aware."...
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15 Gorgeous Cave Paintings
While most cave paintings remain enigmatic, they provide important clues to daily life, religious beliefs, and culture change among prehistoric humans....
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10 Trippy Facts About Triops
Sorry, sea monkeys, but triops are so much cooler than you are....
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Funky Chicken Walk Can Indicate a Sick Bird
Why did the chicken cross the pen? No, seriously. That’s a legitimate scientific question....
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The Strength of Spider Web Glue Is Affected by UV Light
No one has yet made an adhesive based on the spider’s glue. Now we're learning how it's affected by UV light....
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Archaeologists Unearth Civil War Refuge for Escaped Slaves
They've uncovered a treasure trove of archaeological evidence: "There were literally dozens and hundreds of those things.”...
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New Study Reveals How Brushing Your Teeth Helps Keep Your Heart Healthy
New research clarifies how bacteria in our mouths may lead to cardiovascular health problems....
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We're Running Out of Sand
A worldwide construction boom is sucking our global sand supply dry....
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5 Cool Tech Innovations 'Bioinspired' by Animals
From gecko feet to bird beaks, animals have "bioinspired" some remarkable technology....
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