Safari Live - Day 337 | National Geographic

Want to know what the surface of Mars feels like? Well, this is MGS1, a precision Martian regolith simulant used by NASA, ISRO, private space companies, and universities to simulate the ground on Mars. It’s manufactured by Space Resource Technologies righ…

Hi, everyone, Sal Khan here. And I just wanted to invite you, or tell you a little bit about our course on US Government and Civics. The first question you might be wondering is why do I need to learn about government and civics? And what I would tell yo…

Tim Cook of Apple, Sundar Pichai of Google, Elon Musk, Jeff Bezos, the president of the United States—when you think of the people controlling the world, these names come to mind. But the truth is, while these people have a significant influence over our …

So we started with a square wave that had a period of two pi. Then we said, “Hmm, can we represent it as an infinite series of weighted sines and cosines?” Working from that idea, we were actually able to find expressions for the coefficients for a sub 0…

Hello readers. Today I’m going to be talking about the skill of summary, which you might be familiar with in the form of summarizing stories. It’s like a retelling, but shorter and in your own words. This is an important skill – summarizing fiction – but …

In this video, we are going to talk about proportional relationships, and these are relationships between two variables where the ratio between the variables is equivalent. Now, if that sounds complex or a little bit fancy, it’ll hopefully seem a little b…