Safari Live - Day 42 | National Geographic

So the word atom means uncuttable, so the Greeks were thinking of it as a tiny hard sphere. Phil: That’s right. Derek: And even up until the eighteen hundreds, that was the idea of an atom, the smallest piece of matter, a tiny hard sphere. But then we f…

What’s up guys, it’s RAM here. So I’ll admit, over the last three weeks, it’s been my guilty pleasure to wake up every morning and then read the news on what’s going on with Tesla. This has been a little bit like the Jerry Springer of stocks, with wild al…

So let’s say I have two functions that are the inverse of each other. So I have f of x, and then I also have g of x, which is equal to the inverse of f of x, and f of x would be the inverse of g of x as well. If the notion of an inverse function is comple…

If I had a time machine, I think I’d go back to when a Mars-sized protoplanet sideswiped Earth in the early solar system, sideswiping our crust, casting billions of tons of rock into orbit around the Earth, which then coalesced to form our Moon. I want, I…

Hey everyone, welcome to our webinar! My name is Lauren Kwan, and I’m on the Khan Academy team. Today, I am joined by my co-worker, Dan Tu, and our special guest, Connor Corey. Connor is an expert teacher, a parent, and a Khan Academy ambassador, which me…

And by the way, my definition of being properly educated is being right when the professor is wrong. Anybody can spit back what the professor tells you. The trick is to know when he’s right and when he’s wrong. That’s the properly educated person. In the…