Safari Live - Day 337 | National Geographic

Now the last type of bond I’m going to talk about is known as the metallic bond, which I think I know a little bit about because I was the lead singer of a metallic bond in high school. I’ll talk about that in future videos, but let’s just take one of our…

Electricity is all around us all the time. It makes our lives easier, safer, more fun, and most of us never think about it. But is there such a thing as too much electricity? Could the thing that is the foundation of the modern world slowly be killing us?…

Long before we raised livestock and grew crops, humans lived side by side with dogs. It’s widely accepted among scientists that dogs are descendants of wolves. In fact, their DNA is virtually identical. But how exactly did a fierce wild animal become our …

How big is the moon? In the night sky, the moon seems rather small, but in reality, it really isn’t. Central Europe would easily fit under it. The surface area of the moon is huge. To give you some perspective, it’s as big as the whole European continent,…

Teddy’s learning he’s the grasshopper; he’s learning from the master. That’s the way I look at it. [Laughter] Garbage! You know, when you’re a fashionista like me, you can pick style out five yards away already. I’m kicking Teddy’s ass here; this is amazi…

Hi, I’m Megan from Khan Academy, and in this video, we’re going to explore Khan Academy’s course mastery system. At Khan Academy, we’re devoted to mastery learning and build our content around our course mastery system. However, a question we hear freque…