Whether we cry during a sad movie, while chopping onions, or completely involuntarily, our eyes are constantly producing tears. Alex Gendler tracks a particularly watery day in the life of Iris (the iris) as she cycles through basal,...

We've been learning a whole lot about the ocean lately, so we thought it might be fun to put all that knowledge to use with a fun project! Join us as we make an ocean in a jar and learn a little more about the different ocean zones!

Mountains take can take billions of years to form, but the Adirondack Mountains got ahead by recycling itself.

Vikings, volcanoes, and sheep don’t immediately seem like they should all be connected, but this unlikely trio is actually informing our knowledge of global history.

Ever wonder how your finger can magically control your smartphone screen? We explain in this episode of SciShow.

It's freezing outside and cold weather makes Jessi think of glaciers!

How do you make an archaeologist really mad, really fast? Ask her if she’s found any dinosaurs. SciShow helps you Know Your Scientists by explaining the many differences between archaeology and paleontology, and how they’re each awesome...

Squeaks built a pretend time machine, and he and Mister Brown use their imaginations to travel back in time to learn all about the very first living thing!



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Researchers have found ancient communities of microbes that have been buried deep, for a hundred million years! This discovery might be the oldest living thing on Earth, and could even expand the search for life on other planets.

What's the deal with that sharp pain in your side when you're trying to win that marathon? SciShow has the answers!

Diamonds. You see them in jewelry stores, celebrities flaunting them, but where do they come from? Turns out not from coal! Check out this episode to find out what conditions are needed for diamonds to form.

We've talked about a lot of extreme environments in the solar system, but the sun just might be the MOST extreme! Join SciShow as we dive a little deeper into our friendly neighborhood star.

Jewel beetles are pretty eye-catching with their glossy, bright coloration. But if you were a small creature that needed to avoid predators, you might think that eye-catching is the last thing you'd want to be. But it turns out that...

In this video Paul Andersen details the important structures and functions of the integumentary system. The integumentary system includes the skin, hair and nails in humans.

By looking at the layers beneath our feet, geologists have been able to identify and describe crucial episodes in life's history. These key events frame the chapters in the story of life on earth and the system we use to bind all these...

Snorkelers, surfers, divers. They all use them… wetsuits! So how do they work to keep you warm? It turns out layers of materials, and water itself!

Rocks are more than just rocks, they're the key to Earth's history!

The supercontinent Pangaea, with its connected South America and Africa, broke apart 200 million years ago. But the continents haven't stopped shifting -- the tectonic plates beneath our feet (in Earth's two top layers, the lithosphere...

When you think of herbs, you might picture rosemary, basil, or dill weed, but you can add something a bit bigger than that to your mental herb collection: good ol' bananas.

We all need to do it! Learn why we all should brush our teeth, and how brushing keeps our teeth strong and healthy!

We tend to think of blindness as something you're born with, but with certain genetic diseases, it can actually develop when you're a kid, or even when you're an adult. But could blind eyes possibly regenerate? David Davila explains how...

Learn about hypergiant stars -- stars that make the sun look ridiculously tiny.

Like it or not, the ground you’re walking on is always on the move! Join Jessi and Squeaks to learn how this movement can sometimes lead to earthquakes!

You might have heard that Earth is due for a complete flip of its magnetic field. And while our planet does have a history of this behavior, predictions of when it might happen are too complex to estimate a date for.