Mark Zuckerberg on Taking Risks and Finding Talented People

We’ll get a founder that’s like, “Oh, how do I like test my product before I launch to make sure it’s gonna work?” And I always come back and tell the founders the same thing: like if you have a house and it’s got full of pipes, and you know some of the p…

Hey, this is Kim from Khan Academy and today I’m learning about Article 4 of the US Constitution. Article 4 lays out the nuts and bolts of how federalism—the system of shared governance between states and the federal government—works in practice. Article …

When you think about the true cost of space exploration, what do you think of? Maybe you think about the Challenger accident or maybe you think about the Columbia disaster. Anything with the space shuttle blowing up, really. Perhaps the numerous failed te…

It’s time. Let’s reveal the 12,025 Human Era Calendar. Let’s travel back 200,000 years to humanity’s greatest journey that took our ancestors from East Africa all across the planet. With nothing on their feet and only primitive tools, they set out to cro…

What we’re going to do in this video is practice squaring binomials. This is something that we’ve done in the past, but we’re going to do it with slightly more involved expressions. But let’s just start with a little bit of review. If I were to ask you, w…

So I’m going to give another quick overview of photosynthesis, and this time I’m going to break it down into two big stages. As you are probably familiar, just looking at the word photosynthesis essentially has two parts: it has photo, and it has synthes…