The Industrial Revolution: Crash Course European History #24

Hi I’m John Green and this is Crash Course European History. So we’re going to turn our attention now to the Industrial Revolution, one of the most significant developments in human history. Like, imagine with me that it’s 1820. I got this idea from the economist Robert Gordon by the way. You live in, say, […]

Nuclear Physics: Crash Course Physics #45

E=mc^2 You hear it all the time. But what does it mean? During his study of special relativity, Albert Einstein found that mass and energy are equivalent, and that they can be converted back and forth between one another. He described that relationship mathematically, saying that the energy of a particle is equal to its […]

The Engineering Challenges of Renewable Energy: Crash Course Engineering #30

Engineering has given a lot to the world. It’s transformed the nature of work, improved sanitation and helped create vital infrastructure. The bad news is that to power the tools and processes behind those developments, we’ve relied on non-renewable fuels – the kind that get produced at a much slower rate than we use them. […]

ATP & Respiration: Crash Course Biology #7

Oh, hello there. I’m at the gym. I don’t know why you’re here, but I’m going to do some pushups, so you can join me on the floor if you want. Now, I’m not doing this to show off or anything. I’m actually doing this for science. [pained grunt] You see what happened there? My […]

Price Controls, Subsidies, and the Risks of Good Intentions: Crash Course Economics #20

Adriene: Welcome to Crash Course Economics. My name is Adriene Hill Jacob: And I’m Jacob Clifford, and today we’re going to talk about good intentions, and how they can go wrong. Price controls can derail markets. And subsidies can distort them. Adriene: And “deadweight” isn’t just a good description of your ex. [Theme Music] Jacob: […]

Ecosystem Ecology: Links in the Chain – Crash Course Ecology #7

There’s a lot of ideas that we just assume that we know a lot about because we hear about them all the time. For instance, I know what pop music is, but if you were to corner me at a party and say, “Hank, what is pop music?”, I’d be like, “It’s, uh…it’s like, uh…the […]

The Future of Airplanes

These are the technological developments that will allow us to move ourselves and our cargo cheaper, greener, and faster, through the air, going forward. This is the future of flight. With the first all-electric twin-engine, self-powered aircraft successfully crossing the English Channel this month, and the ongoing effort of the Solar Impulse team to become […]

What is Solar Energy?

Did you know that all of the energy we use comes from the sun? You probably know that’s true for solar panels, but the sun is also the ultimate source for energy generated by wind, water, and fossil fuels. It works like this. Heat from the sun drives the air currents and water cycle that […]