So, rocks are hard. But the scale we use to rank them, the Mohs scale, is only really good at quantifying that for one kind of hardness, and topaz is a perfect stone to talk about to explain that. And you can check it out in our SciShow...

One of the toughest materials known to science is made not by humans, but by nature... and it's inside of oysters.

It's one of the most annoying sensations our bodies can feel, but does anything feel better than when you scratch an itch? Ok, maybe *some* things. But itching and scratching are up there. How does this weird sensation work? And what is...

Coding isn't just for computer whizzes, says Mitch Resnick of MIT Media Lab -- it's for everyone. In a fun, demo-filled talk Resnick outlines the benefits of teaching kids to code, so they can do more than just use new tech toys but also...

Bears are known for scratching their backs on trees, but it turns out that they might be using trees as a dating app.

"The computer is an incredibly powerful means of creative expression," says designer and TED Fellow James Patten. But right now, we interact with computers, mainly, by typing and tapping. In this nifty talk and demo, Patten imagines a...

Have you ever said, "No, a little to the left," during a back scratch because the itch itself seemed to move? Well, it has to do with how your nerves and brain respond to the sensation.

When we last left Jessi and Squeaks, Jessi had a big problem: her back was really itchy! Today we'll share our designs for back scratchers and build something to help her out!

One moment, you're fine. The next, moment it seems like your nose is recreating a scene from The Shining. Why do we get nosebleeds?

It’s hard to resist the urge to scratch an itch, but doing so could help break that vicious cycle of itchiness.

The average person experiences dozens of individual itches each day. We've all experienced the annoyance of an inconvenient itch - but have you ever pondered why we itch in the first place? Is there actually an evolutionary purpose to...

One of the toughest materials known to science is made not by humans, but by nature... and it's inside of oysters.

Jessi and Squeaks are ready to play outside, but there’s a unique plant they should be sure to avoid: poison ivy!

Learn why we itch and what scientists have discovered that may help chronic itchiness!

Jessi got a nose bleed while playing outside. In order to make it less scary, Jessi and Squeaks explain why they happen, and how to take care of them.

Discover 5 key chemicals that we use to make our food taste the way it's supposed to taste, look the way we expect it to look, and generally survive the journey to our tables intact.

De-extinction, or using the power of modern biotechnology to bring back extinct species like mammoths and dinosaurs, would be cool. But is it really as easy as the movies make it look? Or do the cruel hands of time make it impossible?...

This video helps in providing an overview of what the course entails and what students can expect to learn.

In this video, we will see our first help tip on how to handle corrupted migrations.

Howcast - Don’t throw out that banana peel—or that overly ripe banana. Put them to good use around your house instead.

Howcast - Learn how to make basic beatboxing SFX in this Howcast video with Beatboxer Entertainment.

Howcast - Learn DJ scratching in this Howcast DJ video with Rock and Soul DJ School.

Howcast - Learn how to do the whiskey water bar trick in this Howcast video.

Howcast - Learn how to do bone breaking and flexing in this street dance video from Howcast.