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/>

Sometimes science creates a mystery, and it can be very difficult to solve! Join Hank for a fun new episode of SciShow about five mysteries started and later solved by science. Let's go! Hosted by: Hank Green

Higher dimensional spheres, or hyperspheres, are counter-intuitive and almost impossible to visualize. Mathematician Kelsey Houston-Edwards explains higher dimensional spheres and how recent revelations in sphere packing have exposed...

A method for thinking about high-dimensional spheres, introduced in the context of a classic example involving a high-dimensional sphere inside a high-dimensional box.

A method for thinking about high-dimensional spheres, introduced in the context of a classic example involving a high-dimensional sphere inside a high-dimensional box.

So... what makes the wind? You might be surprised to learn that it has to do with two of Earth's spheres; The Hydrosphere and the Geosphere. In this episode of Crash Course Kids, Sabrina takes us to the beach to chat about how the wind...

What do raindrops look like? Exactly how we drew them as kids, right? Wrong! Teardrop-shaped rain is physically impossible. This week I went inside a vertical wind tunnel to bring you the true shape of rain.

It's been a long road to the discovery that Earth is not the center of the Solar System, the Milky Way, or the universe; great thinkers from Aristotle to Bruno have grappled with it for millennia. But if we aren't at the center of the...

What do beavers, termites, and prairie dogs have in common? They all change their environments! Last time we talked about how humans change their environments, but humans are animals and all animals change their environments just by...

We're used to talking about planets as spherical objects, but a donut-shaped planet is theoretically possible. What would life be like on one of these?

Last week we went up up up a mountain. Well, today we're going down down down into the ocean to see what habitats await us there. Yep, the ocean has layers and the types of things we encounter there change the deeper we go.

Did you know that all living things change their environments? It's true. Beavers, deer, worms, and humans all change their environments. It just so happens that humans change our environments in big, obvious ways. In this episode,...

What’s irrational and never ends? Pi! Hank explains how we need pi to explain some of the most basic but most important principles of the universe, in honor of Pi Day.

Two proofs for the surface area of a sphere

A beautiful proof of why slicing a cone gives an ellipse.

Tom Shannon shows off his gravity-defying, otherworldly sculpture -- made of simple, earthly materials -- that floats and spins like planets on magnets and suspension wire. It's science-inspired art at its most heavenly.

Asking questions almost always leads to finding answers, but those answers will often pose even more questions. Here are five mysteries started and later solved by science.

Take a journey through Walt Whitman's poem 'A Noiseless Patient Spider' with the help of three animators who each used a different animation style to bring this beautiful poem to life.

When it comes to sparkly objects, the planet Earth has a lot to offer. Here are 5 especially awesome glasses made by nature!

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A beautiful proof of why slicing a cone gives an ellipse.

In this episode of Crash Course Kids, Sabrina talks about two of the four spheres that make up our planet; The Geosphere and the Biosphere. What's in these spheres? How do they affect us? How do they fit into the puzzle that is Earth?...

The second part of our two part tale of the puzzle that is Earth. In this episode, Sabrina talks about the Hydrosphere and the Atmosphere and what is contained in each one. Let's dive in!!! This first series is based on 5th grade...

We've already talked about how the Earth is divided into four spheres (The Hydrosphere, the Biosphere, the Geosphere, and the Atmosphere). But, how do these different sphere interact with each other? In this episode of Crash Course Kids,...

Explore this classic gravitation problem where three masses form an equilateral triangle and a fourth mass is placed at the center. Learn how to calculate the mass required for gravitational force balance and why doubling the central...