Mark Zuckerberg on Taking Risks and Finding Talented People

The Earth isn’t flat. This is something we’ve known now for thousands of years. Aristotle proved it empirically by traveling to Egypt and witnessing new constellations of stars from the other side of the globe. After Eratosthenes used no more than a stick…

Janeshia was an amazing city of the Maya. What we see now is the civic and religious part of it, so we can tell these buildings were sacred. El Castillo, or Temple of Kukulkan, is an amazing building based on astronomical and mathematical science. I’ve be…

Hey guys, welcome back to the channel! In this video, I’m super excited. I got to do a sit down, kind of quick 20-minute interview with Sven Carlin. Of course, you guys all know Sven from over on his YouTube channel. The topic of this conversation was how…

So we have a sum here of 2 plus 6 plus 18 plus 54, and we could obviously just evaluate it, add up these numbers. But what I want to do is I want to use it as practice for rewriting a series like this using sigma notation. So let’s just think about what’…

You want someone to grow old with? You want someone to be a mother for your children, assuming you want children? And if you don’t want children, well, you probably will, and if you don’t, you’re either deluded or immature. And you might say, “Well no, th…

Hi, this is Kim from Khan Academy. Today we’re learning more about Roe vs. Wade—the 1973 Supreme Court case that ruled that the right of privacy extends to a woman’s decision to have an abortion. To learn more about Roe vs. Wade, I spoke to two experts on…