In this video Paul Andersen shows you how to plan and carryout investigations in a mini-lesson on fair tests. Two examples are included in the video and two additional examples are included in the linked thinking slides. <br/>

Amir Nizar Zuabi and Kristine McDivitt Tompkins discuss their shared concerns about humanity's lack of compassion and the interconnected crises of climate change, social injustice, and species extinction. Zuabi reflects on storytelling...

You’re just one history final away from a relaxing spring break. But you still have so much to study! You decide to follow in the footsteps of many students before you, and pull an all-nighter. So, what happens to your brain when you...

If gravity is so attractive, why doesn't the earth just crash into the sun? Or the moon into the earth? The answer: Stable Orbits

What if there were a tunnel through the middle of the earth and you jumped in?

How to Turn Sound Into Light - Sonoluminescence

How To Go To Space (with XKCD!)

How Long Can You Balance a Pencil

In which we explain economic equilibrium, how to make money from nothing, and every fundamental force in physics.

Do We Expand With The Universe

Plate Tectonics Explained

The future of wind energy is solarpunk. At least according to some manufacturers who want to put wind turbines on kites, blimps, or just generally up in the air where wind can generate green energy and fight climate change more efficiently.

Have you ever longed to swim while wielding a longer snorkel? Well, there are a few reasons why they might be shorter than you'd like.

In this episode, we discuss the basic nature of gravity, one of the four fundamental forces in our universe.

The nara melon is as juicy as any other, so how is it able to grow in the hyper-arid Namib desert?

Be careful with your wool. Unless you want a nice piece of felt with some holes in it.

Freezer burn, what's your deal? Why are you ruining our dinner plans?

In this video Paul Andersen explains the importance of intermolecular forces in chemistry. Intermolecular forces exist between dipoles (like hydrogen bonds), between dipoles and induced dipoles (like Ar and HCl) and between induced...

The lower half of Mr. Andersen's head explains why cells are small. This video begins with a simple geometry problem and ends with a discussion of Allen's Rule and reasoning for the microscopic nature of cells.

In which we explain economic equilibrium, how to make money from nothing, and every fundamental force in physics.

What if there were a tunnel through the middle of the earth and you jumped in?

In which Mike Rugnetta teaches you about Ma'ui, prominent hero of many cultures in Oceania, aka the Pacific Island nations. Ma'ui is just the kind of hero we're interested in here at Crash Course. He's a culture hero, he's a an...

Craft curator Nora Atkinson takes us on a trip to Nevada's Black Rock Desert to see the beautifully designed and participatory art of Burning Man, revealing how she discovered there what's often missing from museums: curiosity and...

Terry Moore found out he'd been tying his shoes the wrong way his whole life. In the spirit of TED, he takes the stage to share a better way.