Safari Live - Day 42 | National Geographic

Keep it together, wordsmiths! That’s right, the word in this video is conserve. Conserve is a verb, and it means to keep something safe, to protect a natural resource. You might also see it in its noun form, conservation, as in animal conservation. Let’s…

Up to now, we’ve talked about, uh, resistors, capacitors, and other components, and we’ve connected them up and learned about OHS law for resistors. We also learned some things about series resistors, like we show here the idea of Kirchhoff’s laws. These …

What I’m going to do in this video is make a visual argument as to why the derivative with respect to X of cosine of x is equal to sin of X. We’re going to base this argument on a previous proof we made that the derivative with respect to X of sin of X is…

So we have an infinite series here: one plus one over two to the fifth plus one over three to the fifth, and we just keep on going forever. We could write this as the sum from n equals one to infinity of 1 over n to the 5th power, 1 over n to the 5th powe…

So what I would like to do in this video is graph the inequality negative 14x minus 7y is less than 4. And like always, I encourage you to pause this video and see if you can graph it on your own before we work through it together. So the way that I like…

Hi, I’m Sal Khan, founder of Khan Academy, and with your support I’m excited to say: Here’s just a few of the things that we’ve been able to accomplish together. We now cover a wide range of academic subjects including history, science, grammar, and much…