In which John Green teaches you about Vikings! That's right, one of our most requested subjects, the Vikings, right here on Crash Course. So what's the deal with Vikings? Well, the stuff you've heard about them may not be true. The...

It’s easy to discount the history and evolution of mountains on our jagged world, but they really hold an immense amount of information about history within them. From mountain ranges in space, to why Earth isn’t a waterworld, here are...

Paul Andersen explains how ecosystems change over time. He starts by explaining how global climate change will impacts ecosystems around the planet. He then discusses how continental drift created climatic changes that impacted mammal...

In 1816, Europe and North America were plagued by heavy rains, odd-colored snow, famines, strange fogs and very cold weather well into June. Though many people believed it to be the apocalypse, this "year without a summer" was actually...

Today we're going to tell the story of a quiet revolution in the 1960s that shifted our entire understanding of how the Earth works. We currently believe that the Earth's broken outer shell rises from the mantle and folds back in - kind...

Hank gets to the more violent part of community ecology by describing predation and the many ways prey organisms have developed to avoid it.

After taking you on a journey through geologic time, we've arrived at the Cenozoic Era. Most of the mammals and birds that you can think of appeared during this era but perhaps more importantly, the Cenozoic marks the rise of organisms...

What wiped out the dinosaurs? Most of us were taught it was a killer asteroid—which is true. But it turns out there was more than one disaster movie playing at the cineplex that was Earth 66 million years ago.

In which John Green teaches you about the beginnings of the American Revolution in a video titled The Seven Years War. Confusing? Maybe. John argues that the Seven Years War, which is often called the French and Indian War in the US,...

Have you ever wondered how our earth was created? Here is a brief history about the Earth.

The study of natural history is the study of how the world has changed but Earth itself is in a constant state of flux -- because the ground beneath your feet is always moving. So if we want to know how we got here, we have to understand...

From a special black-footed ferret to coral that can withstand warming waters, genetic rescue efforts that use genomics and synthetic biology are helping nature thrive. But despite the huge successes of this kind of intervention,...

African artifacts shown in museums worldwide are often not borrowed, but stolen -- and TED Fellow Jim Chuchu is on a mission to get them back. Learn the sordid history behind how many of the collections in the West came to be, Chuchu's...

European powers had a lot of wars in the 18th century, and they weren't confined to Europe. Conflict raged across the globe, in what might be called a World War...but we don't call it that, because we already have a couple of those...

When you think of North American cuisine, do Indigenous foods come to mind? Chef Sean Sherman serves up an essential history lesson that explains the absence of Native American culinary traditions across the continent, highlighting why...

North America didn't always have its familiar shape, nor its famed mountains, canyons, and plains: all of that was once contained in an unrecognizable mass, buried deep in Rodinia, a huge supercontinent that lay on the face of the Earth....

Reptiles emerged from the Paleozoic as humble creatures, but in time, they grew to become some of the largest forms of life ever to stomp, swim, and soar across the planet. This Age of Reptiles was a spectacular prehistoric epic, and it...

Beavers have done more to shape North American landscapes than any animal beside humans. We don't notice them much today because there aren't many left, but before colonization, North America was home to hundreds of millions of these...

In which John Green kicks off Crash Course US History! Why, you may ask, are we covering US History, and not more World History, or the history of some other country, or the very specific history of your home region? Well, the reasons...

What happened March 27, 1964? Alaska knows very wellÉ Join us to learn more about earthquakes with host Hank Green on this infusion of SciShow.

Dr. Noor Ali introduces her work as an educator, scholar, and school leader, focusing on the intersection of research and lived experience in understanding Muslim students’ identities. She explains MusCrit, the theoretical framework she...

In this video, discover how leased lines provide dedicated bandwidth for businesses in a WAN environment.

In this video, learn about different WAN connectivity options, including leased lines, MPLS, and broadband connections.

From the forests of North America to the snowy peaks of the Himalayas, legends of mysterious, ape-like creatures have captured imaginations for centuries. In the U.S., it's Bigfoot. In Asia, it's the Yeti. Are they different names for...