Mr. Andersen shows you how to properly core potatoes for the osmosis lab. A thorough description of the lab protocol is included along with a brief description of percent mass change.

Did you know you can read the story of a tree's life? By looking at a tree's rings, you can figure out way more than just how old it is! Jessi and Squeaks are here to show you what to look for next time you're on a hike and find a tree...

Has anyone ever told you, "Stand up straight!" or scolded you for slouching at a family dinner? Comments like that might be annoying"but they're not wrong. Your posture is the foundation for every movement your body makes and can...

How to think about implicit differentiation in terms of functions with multiple inputs, and tiny nudges to those inputs.

A SciShow Kids viewer wrote us to ask how bridges are strong enough to carry cars and trucks! Jessi and Squeaks can explain -- with blocks!

The "Mountain or Valley?" illusion makes our brains turn valleys inside out. But inside-out valleys are a real thing, both on Earth and on...

The marriage of Orpheus, the greatest of all poets and musicians, to Eurydice, a wood nymph, was heralded as the perfect union. Anyone could tell the couple was deeply in love. So when their wedding ceremony ended in Eurydice's untimely...

Euclid, known as the "Father of Geometry," developed several of modern geometry's most enduring theorems--but what can we make of his mysterious fifth postulate, the parallel postulate? Jeff Dekofsky shows us how mathematical minds have...

History's first empire rose out of a hot, dry landscape, without rainfall to nourish crops, without trees or stones for building. In spite of all this, its inhabitants built the world's first cities, with monumental architecture and...

Paul Andersen gives ten tips on increasing comprehension.

Paul Andersen explains how polymers are formed from monomers. He describes how carbohydrates, protein and nucleic acids are created through condensation reactions. He also explains how these macromolecules are broken down through the...

Have you tried to dig a deep hole? So deep that you could dig all the way to the other side of the Earth? It's pretty hard, and lots of people have tried. So what's stopping us from digging through the Earth? It has something to do with...

Let's say you're looking for a specific constellation in the sky, but can't find it? That could be because you're on the wrong part of the planet to see it. In this episode of Crash Course Kids, Sabrina talks about how the Earth's...

"I dream of a world where geography classes teach about the climate crisis as this one great challenge that was won by people like you and me," says climate activist Luisa Neubauer. With Greta Thunberg, Neubauer helped initiate "Fridays...

Hank takes a break from the desk to bring you to the lab in order to demonstrate some important points about the practical side of chemistry - experimentation in the laboratory. You'll learn what to wear in the lab, how to dispose of...

It might be possible to run on water, as long as you're not on earth.

Jessi and Squeaks use the power of the sun to conduct a cool science experiment!

Mr. Andersen uses chromosome beads to simulate both mitosis and meiosis. A brief discussion of gamete formation is also included.

In this video Paul Andersen explains how objects in contact with varying temperatures will eventually reach thermal equilibrium with equal temperatures. The amount of thermal energy transferred is related to the mass and temperature of...

Have you noticed that the moon looks different over the course of the month? Follow along with this fun activity to help you remember the different phases of the moon!

Jessi and Squeaks are really excited about the total solar eclipse on August 21st, so they're revisiting all the amazing things they've learned about the sun, the moon, and how eclipses happen!

In this episode of Crash Course Astronomy, Phil takes you through the cause and name of the Moon's phases.

In this video Paul Andersen explains how soils are formed and classified. Weathering of rock creates particles which are mixed with water, air, and organic material. Soils are classified according to particle size, chemical makeup, and...

It's an increasingly common sight in hospitals around the world: a nurse measures our height, weight, blood pressure, and attaches a glowing plastic clip to our finger. Suddenly, a digital screen reads out the oxygen level in our...