According to the cosmological principle, the universe is more or less the same in all directions. But what happens when we put this to the test?

The Hypatia stone is one of the weirdest rocks on the planet. It's not just out of this world, it might be out of this solar system!

We’ve created simulations to recreate the difference in time it takes for the Sun’s equator and poles to complete rotations, and the way we’ve solved is a bit surprising. And it looks like the Milky Way may not be great at mixing metals,...

The name “The Big Bang” makes it sound like there was a big explosion in one particular spot, but if that’s the case, where did it happen?

We just learned how to solve homogenous linear second-order differential equations. Now it's time to tackle the non-homogenous variety. This will start out the same way that we learned in the previous tutorial, but that will get us...

Now that we know what differential equations are, we have to learn how to classify them. We have to know whether a DE is ordinary or partial, linear or nonlinear, homogenous or nonhomogenous, autonomous or nonautonomous. We have to be...

We have covered three classes of first-order differential equations, those being separable, linear, and exact. There are just two more to go over, those being homogenous and Bernoulli differential equations. What are these, how do we...

Process costing concerns assigning the cost of produciton of a product on a per unit basis to a specific period. There are multiple steps in the process and means of allocating costs.

The substance, such as water, in which another substance can dissolve.
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A Twig Science
Glossary Film.
Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig...

A homogeneous mixture of more than one substance, with the different particles evenly distributed throughout.
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A Twig Science
Glossary Film.
Key scientific terms defined in just 60 seconds using stunning images...

Homogeneous and Heterogeneous Mixtures explores characteristics of mixtures and solutions by explaining homogenous and heterogeneous mixtures.

Mixtures and Solutions explores properties of matter by differentiating between pure substances, mixtures, and solutions.

Duke neuroscientist Miguel Nicolelis describes why he believes that our brains are analogous to the internet, with main processing servers spread out in different regions.

It explains the process of catalysis. It describes the homogeneous and heterogeneous catalysis. It discusses the adsorption theory of heterogeneous catalysis.

Process costing concerns assigning the cost of produciton of a product on a per unit basis to a specific period. There are multiple steps in the process and means of allocating costs.

Through animation and video footage students will learn that there are two basic types of catalysts, heterogeneous and homogeneous. Students will come to understand that catalysts have many practical applications and that scientists use...

It explains solution and its properties. It also talks about the concentration of a solution.

It defines homogeneous differential equation and explains method to solve it.

Through animation and video footage students will learn that there are two basic types of catalysts, heterogeneous and homogeneous. Students will come to understand that catalysts have many practical applications and that scientists use...

Life is tough for thirsty pirates – the sea is filled with water that can’t be drunk! Thankfully, Blackbeard has figured out a trick. This lesson will compare heterogeneous and homogeneous mixtures. We’ll also look at solutions, which...

Learn the basics about separating solutions, mixtures and emulsions when learning about separation techniques as a part of chemical tests. A solution is a mixture of two or more substances in the same phase. It is formed when a solute...

What's the difference between a physical change and a chemical change? What are elements, compounds, pure substances, and mixtures? So many definitions to learn! Don't worry, Professor Dave will take you through the details.

side view impact testing for polymer.an ASTM standard method of determining impact strength. A notched sample is generally used to determine impact strength.

close up impact testing for polymer.an ASTM standard method of determining impact strength. A notched sample is generally used to determine impact strength.