Crash Course
Intro to Evolution: What We Can Learn From a Giraffe's Neck: Crash Course Biology #11
New ReviewFrom a single-celled common ancestor, evolution has brought us all of Life’s Greatest Hits — including butterflies, beetles, bacteria, and human beings. In this episode of Crash Course Biology, we’ll learn how evolution explains life’s...
Crash Course
Phylogeny: How We're All Related: Crash Course Biology #17
New ReviewCrocodiles, and birds, and dinosaurs—oh my! While classifying organisms is nothing new, phylogeny— or, grouping organisms by their evolutionary relationships—is helping us see life in a whole new light. In this episode of Crash Course...
Crash Course
Evolutionary History: The Timeline of Life: Crash Course Biology #16
New ReviewHumans may have been around for a long time, but life has existed for way longer. In this episode of Crash Course Biology, we’ll journey through deep time to uncover the history of life on Earth. We’ll explore the big, game-changing...
Crash Course
Speciation: Where Do Species Come From?: Crash Course Biology #15
New ReviewHow can you tell two species apart? It’s not always simple. In this episode of Crash Course Biology, we’ll learn about speciation—a process that can happen over millions of years, or within a single generation. Along the way, we’ll...
Crash Course
Natural Selection: Life's Way of Stayin' Alive: Crash Course Biology #13
New ReviewThere are lots of ways that evolution happens, and natural selection is just one of them. In this episode of Crash Course Biology, we’ll find out how this process works and shapes traits in all living things —from ginkgo trees to howler...
Crash Course
Microevolution: What's An Allele Got to Do With It?: Crash Course Biology #12
New ReviewWhether we’re talking about tigers, trees, or tarantulas, evolution happens at the level of the population. In this episode of Crash Course Biology, we’ll find out how natural selection, gene flow, genetic drift, and other processes...
Crash Course
The Effects of Climate Change: Crash Course Biology #9
New ReviewClimate change shakes up all of Earth’s systems, including the living ones. In this episode of Crash Course Biology, we’ll see how climate change’s effects rattle the entire chain of life. Changes felt in one population ripple out to...
Crash Course
What is Climate Change?: Crash Course Biology #8
New ReviewLife on Earth has weathered boiling-hot oceans and volcanic-ash-darkened skies—but that’s nothing like the climate change we’re experiencing now. In this episode of Crash Course Biology, we’ll talk about the greenhouse effect, learn why...
Crash Course
Taxes: Crash Course Economics
We've been talking about the unavoidables recently. Last time, we covered Death. This time, it's taxes. So, what are taxes? Why do we pay taxes? What is all that tax money used for? This week, Adriene is going to cover all that and more....
Crash Course
Revenue Streams: Crash Course Entrepreneurship
Profit, revenue, income, assets, cash flow -- all these words mean money, but they all have specific uses. In business, money is important to us and we want to describe it as accurately as possible.
Crash Course
How World War I Started: Crash Course World History 209
In which John Green teaches you about World War I and how it got started. Crash Course doesn't usually talk much about dates, but the way that things unfolded in July and August of 1914 are kind of important to understanding the Great...
Crash Course Kids
Weather vs. Climate
So we have Weather and Climate... but are they the same thing? No, no they are not. But they are both super important to how the geosphere is shaped. In this episode of Crash Course Kids, Sabrina chats with us about the differences...
Crash Course Kids
Severe Weather
So, what's the difference between 'weather' and 'severe weather'? Is it just how hard the wind is blowing? Is it just thunder and lighting? Well, it can be some or all of those things. In this episode of Crash Course Kids, Sabrina talks...
Crash Course
Let's Talk About Sex: Crash Course Psychology
Sex is complicated for different reasons in different cultures. But, it's the entire purpose of life, so there's no reason to blush. In this episode of Crash Course Psychology, Hank talks about Kinsey, Masters and Johnson, Sexuality,...
Crash Course
Who Started World War I: Crash Course World History 210
In which John Green teaches you WHY World War I started. Or tries to anyway. With this kind of thing, it's kind of hard to assign blame to any one of the nations involved. Did the fault lie with Austria-Hungary? Germany? Russia? Julius...
Crash Course
Post-World War II Recovery: Crash Course European History
At the end of World War II, the nations of Europe were a shambles. Today we'll learn about how the various countries and blocs approached the problem of rebuilding their infrastructure and helping their residents recover. You'll learn...
Crash Course
Labor Markets and Minimum Wage: Crash Course Economics
How much should you get paid for your job? Well, that depends on a lot of factors. Your skill set, the demand for the skills you have, and what other people are getting paid around you all factor in. In a lot of ways, labor markets work...
SciShow
The Last Living Thing Won't Be a Cockroach
There are several ways the world could end, and scientists have given a lot of thought to what the last living thing will be.
Crash Course
Booker T. Washington and W.E.B DuBois
As the 19th century gave way to the 20th, Black Americans were searching for ways to think about how and where they would fit into a post-slavery society. There were several competing schools of thought. Booker T. Washington and W.E.B....
Crash Course
Political Ideology: Crash Course Government and Politics #35
So today Craig is going to look at political ideology in America. We're going to focus on liberals and conservatives and talk about the influencers of both of these viewpoints. Now, it's important to remember that political ideologies...
Crash Course
Witches and Hags: Crash Course World Mythology #39
This week, Mike is teaching you about the most mythic of mythological creatures: Dragons. Cultures across the world (and across Westeros) tell stories of dragons, and their power to destroy, their power to prop up kings, and their power...
Crash Course
Serpents and Dragons: Crash Course World Mythology #38
This week, Mike is teaching you about the most mythic of mythological creatures: Dragons. Cultures across the world (and across Westeros) tell stories of dragons, and their power to destroy, their power to prop up kings, and their power...
Crash Course
Mythical Language and Idiom: Crash Course World Mythology #41
It's the end of the world, everybody. Well, it's the end of our mythology series, anyway. This week, we're talking about how mythological themes have made their way into the English language. We're taking on the Herculean task of...
Crash Course
Mythical Horses: Crash Course World Mythology #37
Horses have been human companions for thousands of years, and have been essential companions and tools for the development of human culture. So, it makes sense that horses would make their way into our most important stories. Today,...