This is a love letter to water, life’s solvent, and one of the most wonderful molecules around. In this episode of Crash Course Biology, we’ll learn about how water’s polarity and hydrogen bonding help it sustain life on a larger scale....

Ash Beckham recently found herself in a situation that made her ask: who am I? She felt pulled between two roles — as an aunt and as an advocate. Each of us feels this struggle sometimes, she says -- and offers bold suggestions for how...

Hank tells us about some developments that are being made in the dramatic area of laser tractor beams.

Molecules come in infinite varieties, so in order to help the complicated chemical world make a little more sense, we classify and categorize them. One of the most important of those classifications is whether a molecule is...

Why does ice float? You might not think about it, but this special property of frozen water is what makes your iced tea tinkle and makes a lot of aquatic life possible. Hank gets in touch with his inner Olaf to explain the wonder that is...

Hank teaches us why water is one of the most fascinating and important substances in the universe.

This week, Hank elaborates on why Fugu can kill you by illustrating the ideas of solutions and discussing molarity, molality, and mass percent. Also, why polar solvents dissolve polar solutes, and nonpolar solvents dissolve...

Atoms are a lot like us - we call their relationships "bonds," and there are many different types. Each kind of atomic relationship requires a different type of energy, but they all do best when they settle into the lowest stress...

So we’ve talked about computer memory a couple times in this series, but what we haven’t talked about is storage. Data written to storage, like your hard drive, is a little different, because it will still be there even if the power goes...

In this video Paul Andersen explains the vital role that water plays in the processes on the Earth's surface. Water has several unique properties including high heat capacity, transparency, polarity and the ability to change the...

Howcast -Learn how to read reversed tarot cards from expert Ellen Goldberg, M.A. in this Howcast video.

What is the difference between a molecule and a compound? What are the main types of chemical bonds? In this video, we will be answering those questions and more.

Using a black marker, water and a coffee cup filter, Dr. Boyd explains and then demonstrates the analytical technique known as Paper Chromatography. Minute 0:30 – Introduction Minute 0:42 – What you need Minute 1:04 – Chromatography...

Electrical polarity is the arrangement of positive and negative charge in an electrical circuit, or distribution of positive and negative charge in, for example, a chemical bond. A Twig Science Glossary Film. Key scientific terms defined...

Are you struggling to understand the difference between polar and nonpolar covalent bonds? This video explains these important chemistry concepts with simple explanations and clear examples.



Learn how electronegativity...

The inductive effect can also influence a molecule’s dipole moment, which measures the separation of charges within a molecule. Electron-withdrawing groups create a stronger dipole by pulling electron density away from less...

The inductive effect is all about how atoms in a molecule affect electron distribution. Electron-withdrawing groups, like halogens, pull electrons through sigma bonds, reducing electron density in adjacent atoms. Conversely,...

The weirdest thing about microwaves

Learn how to use both active and passive buzzers to add sound to your Arduino projects.

What's inside a stepper motor? in this video we learn what components are inside a stepper motor.

Learn how hybrid stepper motor works in this video on hybrid stepper motor basics, covering the rotational magnetic field as well as the rotor and stator.

How does an electronic expansion valve work EEV EXV. In this video we're going to cover the basic working principles for how an electronic expansion valve works in a refrigeration system. Learn HVAC enineering with animations and 3d...

In this video, we'll look at how an electric motor works- specifically, the DC motor. We'll discuss the different parts of the motor, and how they work together to create movement.

Stepper motors. How electric motors work, stepper motors explained. Learn how they work and why they are used from the basics. Learn the main parts, how it works, controller, driver, stepper motor types, what is a step, hybrid stepper...