You might have heard about animals behaving oddly right before an earthquake hits. But are these reports more than just anecdotes?

In this, THE FIRST EPISODE of Crash Course Physics, your host Dr. Shini Somara introduces us to the ideas of motion in a straight line. She talks about displacement, acceleration, time, velocity, and the definition of acceleration. Also,...

It’s so easy to forgive a dog, especially when they start with those puppy dog eyes. As it turns out, those puppy dog eyes and the effect they have are no accident and the result of centuries of domestication.

Your town is holding a mayoral election and the stakes have never been higher. You suspect one of the candidates will begin pushing false information to swing the election. As the cybersecurity expert, your job is to inoculate the...

How does knowledge grow? Sometimes it begins with one insight and grows into many branches; other times it grows as a complex and interconnected network. Infographics expert Manuel Lima explores the thousand-year history of mapping data...

SciShow Space explores the origins of Earthquakes that aren't on Earth. Moonquakes and Marsquakes can happen, too!

You're on an airplane when you feel a sudden jolt. Outside your window nothing seems to be happening, yet the plane continues to rattle you and your fellow passengers as it passes through turbulent air in the atmosphere. What exactly is...

Humans (and our pets) frequently instinctively stretch as soon as we wake up. But why? What is happening in our bodies when we stretch and yawn to wake ourselves up?

We continue our look at your bones and skeletal system, skipping over the silly kid's song in favor of a more detailed look at your your axial and appendicular skeleton. This episode also talks about the structural and functional...

How counting in Ternary can solve a variant of the Tower's of Hanoi puzzle, and how this gives rise to a beautiful connection to Sierpinski's triangle.

John Gerzema says there's an upside to the recent financial crisis -- the opportunity for positive change. In this talk, he identifies four major cultural shifts driving new consumer behavior and shows how businesses are evolving to...

Explore how substances travel in diffusion with the Amoeba Sisters! This video uses a real life example and mentions concentration gradients, passive transport, facilitated diffusion, and explains why diffusion is critical for all...

Why is it hard to move a heavy bookcase across a carpeted floor? And why is it easier to keep it moving than it was to get it started moving? You might think it's all about weight, but actually it's about friction. Two kinds of friction!...

What's the deal with that sharp pain in your side when you're trying to win that marathon? SciShow has the answers!

* Viewer discretion advised. This video includes discussion of mature topics and may be inappropriate for some audiences. Here's a TED first: an animated Socratic dialog! In a time when irrationality seems to rule both politics and...

At 18, Natalie Warne's work with the Invisible Children movement made her a hero for young activists. She uses her inspiring story to remind us that no one is too young to change the world.

Birds fly, and fish swim. We learn this when we are children. But not everything in nature is quite so simple… Meet Limacina helicina, an artic-dwelling sea butterfly that flies through the water.

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Biodiversity is the key to life on Earth and reviving our damaged planet, says ecologist Thomas Crowther. Sharing the inside story of his headline-making research on reforestation, which led to the UN's viral Trillion Trees Campaign,...

If you stick water in the freezer, it will take a few hours to freeze into ice. How is it, then, that cold packs go from room temperature to near freezing in mere seconds? John Pollard details the chemistry of the cold pack, shedding...

In which John Green teaches you about a time of relative tumult in the United States, the 1960s. America was changing rapidly in the 1960s, and rights movements were at the forefront of those changes. Civil Rights were dominant, but the...

Born out of a social media post, the Black Lives Matter movement has sparked discussion about race and inequality across the world. In this spirited conversation with Mia Birdsong, the movement's three founders share what they've learned...

Nalini Nadkarni challenges our perspective on trees and prisons -- she says both can be more dynamic than we think. Through a partnership with the state of Washington, she brings science classes and conservation programs to inmates, with...

The supercontinent Pangaea, with its connected South America and Africa, broke apart 200 million years ago. But the continents haven't stopped shifting -- the tectonic plates beneath our feet (in Earth's two top layers, the lithosphere...

Explore how the Women’s Suffrage Parade on Washington in 1913 helped women secure the right to vote in the United States through the 19th amendment. -- On March 3, 1913, after months of strategic planning and controversy, thousands...