Safari Live - Day 337 | National Geographic

This program features live coverage of an African safari and may include animal kills and carcasses. Viewer discretion is advised. Good afternoon, and a very warm welcome to a sunny, beautiful afternoon in South Africa. As you can see, there are some big…

The mind is its own place, and in itself can make a Heaven of Hell, a Hell of Heaven. John Milton. In a dirty prison cell, there lived a man who dedicated his whole life to isolating himself from the world. As opposed to most prisoners, he wasn’t put the…

I’m headed to the lost city of Chanchan, once the beating heart of the mighty Chimu Empire. Is that a pyramid? I think that’s a pyramid, a pyramid at Chanchan. Can I find answers inside the city walls as to why the children had to die? Built over a thousa…

So we are given these two complex numbers and we want to know what ( w_1 ) divided by ( w_2 ) is. So pause this video and see if you can figure that out. All right, now let’s work through this together. The form that they’ve written this in actually make…

So the problem with allowing this spark to happen across here is if this is not a mechanical switch, we can build switches out of electronic devices as well. This is what we use transistors for, and a transistor is a rather small, delicate device. So if …

So we tend to view evolution and natural selection and the formation of new species, which is often called speciation, as a slow process that could take tens or hundreds of thousands of years, or in many cases millions of years. And that’s why it’s always…