We ranked dragons based on how biologically and evolutionarily plausible they are.

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Mr. Andersen explains the importance of physics as a science. History and virtual examples are used to give the discipline context.

Wondering how you can catch the perfect wave? Dive into the fascinating and complex physics of surfing. -- Whether or not you realize it, surfers are masters of complicated physics. The science of surfing begins as soon as a board...

Mr. Andersen explains the concept of momentum. He also shows you how to solve simple momentum problems. He finally shows you how momentum is both conserved and relative.

Why would it be hard to pedal a 10,000 pound bicycle? This simple explanation shows how Newton's 3 laws of motion might help you ride your bike.

Light, bright, and cheerful, "The Four Seasons" by Antonio Vivaldi is some of the most familiar of all early 18th century music, featured in numerous films and television commercials. But what is its significance, and why does it sound...

Mr. Andersen describes how plate tectonics shapes our planet. Continental and oceanic platers are contrasted and major plate boundaries are discussed.

Have you ever noticed the moon hanging out in the daytime sky and wondered why? Join Jessi and Squeaks to find out!

In this video Paul Andersen explains how simple harmonic motion occurs when a restoring force returns an object toward equilibrium. The two types of harmonic motion studied in AP Physics are the mass spring oscillator and the simple...

We're finally to the end of our time together here on Crash Course Study Skills, so this week we're taking a more holistic approach to being the best learner you can. Part of taking care of your brain is taking care of your whole body,...

You're alive! And so are all the plants in your garden, the birds in the sky, and the fish in the ocean! But how do we know they're alive? What does it even mean to be alive in the first place!? Join Jessi and Squeaks to learn how...

Paul Andersen takes you on a tour of the cell. He starts by explaining the difference between prokaryotic and eukaryotic cells. He also explains why cells are small but not infinitely small. He also explains how the organelles work...

Have you ever wondered how you can turn the light on in your house? Or maybe why you can push a doorbell and it makes a sound? This happens because of circuits! Join Jessi and Squeaks as they learn how circuits work, and make their very...

In this video Paul Andersen explains how electric circuits contain different elements which can be connected in series or in parallel. The following four elements are explained in detail; emf, resistor, capacitor, and switch. The...

In this video Paul Andersen explains how the quantum mechanical model of the atom refined the shell model. Uncertainty of the position of the electron as well as spin forces chemists to create an improved model. In this model the...

Tornadoes are one of nature’s most powerful forces -- see where they come from, how fast they go, and how scientists study them!

Join Jessi and create your own mini landscape, to see how water can cause erosion, and change a landscape into something different! #sciencegoals

In this video Paul Andersen explains how society influences the natural world through increasing science, engineering and technology. As the world population increases it will require more natural resources and it will impact the global...

Jessi brought one of her favorite toys to the fort, a magnet! Let's see what it can stick to!

Everyone feels angry sometimes, and anger is a natural way that our bodies keep us safe from danger! Jessi and Squeaks are here to tell you all about why we feel angry, and how to control it when getting in mad isn't the right choice!

Hank tells us about the city of Eukaryopolis - the animal cell that is responsible for all the cool things that happen in our bodies.

New ReviewGood ol' corn starch to the rescue!

New ReviewPlace your bets!

New ReviewWe use words left behind by the Romans every day. Their encounters with the Germanic tribes caused Latin words to slip into our language before it even became "English". In this video let's explore all the words that we've borrowed from...