Safari Live - Day 42 | National Geographic

We’ve done many videos on Khan Academy on evolution and natural selection explaining them, but I thought I would do a video going a little bit more in-depth in evidence for evolution and natural selection. I starting with this quote: “Nothing in biology m…

After the Civil War, there were enormous changes in American life, with industrialization, urbanization, and immigration changing the composition of who lived in the United States, where they lived, and what they did for a living. But city living and fact…

Told the function G is defined over the real numbers. This table gives a few values of G. So for a few values of X, they give us what G of X is equal to. And they say what is a reasonable estimate for the limit of G of X as X approaches 9 from the left or…

What we’re going to do in this video is talk about the idea of federalism, which is core to the United States government. Now, federalism, the word originates, its root comes from the Latin word “fetus,” which I’m probably not pronouncing perfectly, but …

[Music] This was good. Gross forest was not like that. What you can see now, this whole thing that we are seeing, that is dry land right now, was not here then. In 50 years, have this destruction. You can see forest, and next to a clear cut for a mile lo…

Compare 98,989 and 98,899. So we want to compare these two numbers, and to do that, let’s first think about what these digits mean. What do these numbers actually mean? Looking first at our number on the left, we have a 9 all the way to the right, or in …