Safari Live - Day 42 | National Geographic

[Applause] Wow, there are a lot of you! That’s awesome to see. You know, I got some emails over the last 24 hours from people saying how excited they were to come to this talk. I want you to know I’m humbled by that, and, uh, also a little intimidated. I …

Acetic acid is an example of a weak acid, and sodium hydroxide is an example of a strong base. When acetic acid reacts with sodium hydroxide, an aqueous solution of sodium acetate is formed along with water. Since this reaction is an acid-base neutralizat…

Among homegirls in the world, the helmet of hornbill is the most unique species. The only hundred species who has a solid cusp features has been recognized for its ivory light quality. Well, we know that it just lives in the old ancient Sunday forests of …

Steve: “What are we doing here? Hey, sell, we’re going to look at this question of why do Empires fall. For those of you who don’t know, Steve Shrer, he is a world history fellow here at Khan Academy, and also a former world history teacher. So, what we …

[music playing] NARRATOR: And while sharks have always been present along this massive shoreline, starting in 2010, they become a problem. More than 60 attacks in just 10 years, triple the number of incidents from the preceding decade—it’s an unprecedent…

Some students want to know what gets used up in an incandescent light bulb when it is in series with a resistor: current, energy, or both. They come up with the following two questions: in one second, do fewer electrons leave the bulb than enter the bulb?…