At the INK Conference, Arvind Gupta shares simple yet stunning plans for turning trash into seriously entertaining, well-designed toys that kids can build themselves -- while learning basic principles of science and design.

Jessi and Squeaks have talked about how wells move water from one place to another before; now they're going to show you how to build your very own so you can see for yourself!

SciShow explores a place that's as beautiful as it is dangerous: Mexico's Giant Crystal Cave, where chemistry has created the world's largest crystals -- but in an environment so hostile that you'd only survive a few minutes if you saw...

Hank describes how cells regulate their contents and communicate with one another via mechanisms within the cell membrane.

Springtime means the arrival of green grass, bright flowers, and buzzing bees. But for many of us, it's also about sneezing, watery red eyes, and a runny nose, thanks to allergies. In this week's video, you'll learn why we get allergies,...

For most of history, scientists weren't quite sure why our hearts were beating or even what purpose they served. Eventually, we realized that these thumping organs serve the vital task of pumping clean blood throughout the body. But how?...

At this moment, three hundred million women across the planet are experiencing the same thing: a period. The monthly menstrual cycle that gives rise to the period is a reality that most women on Earth will go through in their lives. But...

If you want to be able to breathe underwater, you're going to need to get creative. So some turtles, dragonfly nymphs, and sea cucumbers decided to use their butts.

Today we’ll dive further into fluid flow and how we can use equipment to apply our skills. We explain Bernoulli’s Principle and the relationship between speed and pressure in certain flowing fluids. We’ll also discuss how to apply the...

Spit is critical for our health. Actually.

Which Came First - The Rain or the Rainforest

Does your heart rate have an upper limit and could you ever reach it?

Did you know that when you’re soaring on the swings, or sliding down the slide, you’re taking part in some seriously cool science? Jessi explains the forces you can find at the playground!

In this video Paul Andersen explains the importance of oxygen in accepting electrons. He begins with a brief description of combustion. He then explains the role of oxygen in aerobic cellular respiration.

Your heart gets a lot of attention from poets, songwriters, and storytellers, but today Hank's gonna tell you how it really works. The heart's ventricles, atria, and valves create a pump that maintains both high and low pressure to...

Hank takes us on a trip around the body - we follow the circulatory and respiratory systems as they deliver oxygen and remove carbon dioxide from cells, and help make it possible for our bodies to function.

It's time to start talking about some of the terrible things you can do to your own body, like blood doping. We'll start by explaining the structure and function of your erythrocytes, and of hemoglobin, which they use to carry...

In this video Paul Andersen compares and contrasts mechanical and electromagnetic waves. Both types of waves transfer energy through oscillations but mechanical waves requires a medium. Several examples of each type of wave are included.

If you lined up all the blood vessels in your body, they'd be 60 thousand miles long. And every day, they carry the equivalent of over two thousand gallons of blood to the body's tissues. What effect does this pressure have on the walls...

This video was created with support from the U.S. Office of Research Integrityhttp://ori.hhs.gov.' target='_blank' rel='nofollow'>Integrity For several centuries, people though diseases were caused by wandering clouds of poisonous...

Does the world’s most common pain relief drug do more than just reduce pain? Recent headlines would have you believe that it also reduces your perception of risk, resulting in more risk-taking behaviors. We think it’s time to take a...

How Much Blood Does the Heart Pump?

Howcast - People have been digging wells since prehistoric times. If you're hoping to add a well to your backyard by doing it yourself, there are several ways -- both ancient and modern -- to make sure you never go thirsty.

Howcast - Learn the basic techniques of making balloon animals from magician Jonas Cain in this Howcast video.