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Why Do More Species Live Near The Equator?
Find out why more species live near the equator!
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3 Incredible Examples of Evolution Hidden In Your Body
Humans are special, and we got that way thanks to evolution and natural selection. The proof is right there in our bodies! From anatomy to genes, here are some stories of how you got to be the way you are.
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Zombie Parasites!
Shows like The Walking Dead are full of hungry, mindless, surprisingly fleet-footed armies of brain-eating zombies. Could they actually exist? Are zombies real? Well, maybe if you're talking about zom-bees! This week I introduce you to...
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What Are Rainbows?
Dorothy went over one. LeVar Burton read to us under one. In a song, Kermit the Frog connected us to one. Even Mork's suspenders were made of them. Our culture, and our skies, are full of rainbows, but do you know how they form? Do we...
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How Many Heartbeats Do We Get?
Ever wonder how the heart symbol came to stand for the actual heart? And why do we speak of the heart as the seat of love, when love really happens in our brains? Is it true that animals only get a billion heartbeats? This week, we give...
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Sonic the Hedgehog Is Why You Have Thumbs!
The human hand, with its multi-talented thumb, might be man's greatest tool. But did you know we can trace that thumb, and the hand and arm it's connected to, all the way back to a 375 million-year-old fish named Tiktaalik? This week I...
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What's The Loudest Possible Sound?
What is the loudest possible sound? What about the quietest thing we can hear? And what do decibels measure, anyway? In this video you'll learn what makes sound
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Claude Monet Was Half Honeybee
Claude Monet had a very unique eye, and it can teach us a bit about the science of vision
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Why Is The Universe So Empty? (ft. PHD Comics!)
Why is the universe organized the way it is? And why is it so empty? From planets and stars to superclusters and galactic filaments, the universe's largest structures formed because of its smallest. In this special collaboration with PHD...
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5 Weird Involuntary Behaviors Explained!
Our bodies do a lot of weird things, and many of them are completely involuntary. Why do we often jerk our bodies awake right before falling asleep? Why do we yawn? Why do we hiccup? Why do some people sneeze when they look at the sun?...
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Could You Be Immune To Everything?
Do you remember having a cold in 5th grade? Or the flu a couple years ago? Your immune system does. Our bodies hold many levels of immune defense. Millions of B cells and T cells and antibodies are constantly on patrol for germs and...
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El Nino and Why We Can't Predict the Weather
What is El Nino? Why can't we predict the weather? Just a few slight changes in global climate patterns can drastically shift the weather. Thanks to chaos theory, even our smartest meteorologists can't predict weather correctly.
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Carbon and Oxygen and You: Explained
A little bit of explanation for the cycle of carbon and oxygen
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Are We All Related?
In part 3 of our special series on human ancestry, we investigate how closely related we all really are. Basic math tells us that all humans share ancestors. But you'll be amazed at how recently those shared ancestors lived. Thanks to...
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Why Seasons Make No Sense
Day by day, country by country, we tend to measure seasons differently.
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The Cosmic Origins of Earth's Water
Why is Earth is a blue planet? Because it's covered in water! Where did Earth's water come from? Of course, water isn't unique to our planet. The origin of water traces beyond the solar system to the earliest days of the universe. Here's...
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How The Pyramids Were Built (Pyramid Science Part 2)
Just because something is difficult doesn't mean it's impossible. Over the past centuries, archaeologists, historians, and engineers have reconstructed a great deal of the technology and science used to build the Egyptian pyramids. This...
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How Your Body Knows Left From Right
This is part 3 of 3 in my series about how our bodies evolved to look like they do.
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Why is the sky any color?
Why is the sky blue? It's a question that you'd think kids have been asking for thousands of years, but it might not be that old at all. The ancient Greek poet Homer never used a word for blue in The Odyssey or The Iliad, because blue is...