Ex-CIA Spy: China Is Preparing & We're Not Paying Attention! Here's What Happens If They Takeover!

This is the world’s strongest magnet, capable of sucking objects in and generating electric current. Can you see that? And levitating non-magnetic objects. It even wreaks havoc on camera equipment. Wire is magnetic! So if it’s a CMOS sensor, the electro…

Fun fact: Planet Earth is 4.5 billion years old. Mankind is about 140,000 years old. Let me put that in perspective. If you condense the Earth’s lifespan into 24 hours, that’s one full day. Then we have been here on this planet for, drum roll please, 3 se…

Hello grammarians! Welcome to one of the thorniest fights in English usage today: the question of whether or not you should use “who” or “whom” in a sentence as a relative pronoun. So there’s this basic idea that “who” is the subject form, and “whom” is …

[Instructor] We’re told that three possible resonance structures for the thiocyanate ion are shown below. All right, there we have them. Based on formal charges, which of the three structures contributes most to the resonance hybrid of thiocyanate? And …

[Voiceover] I would like to welcome you to Biology at Khan Academy. And biology, as you might know, is the study of life. And I can’t really imagine anything more interesting than the study of life. And when I say “life,” I’m not just talking about us, h…

So we have four different molecules here, and what I want you to think about is if you had a pure sample of each, which of those pure samples would have the highest boiling point, second highest, third highest, and fourth highest? Pause this video and try…