Safari Live - Day 121 | National Geographic

The difference with “The Beginning of Infinity” is that you’re getting a worldview. You’re not being given the standard take from physicists about how to understand quantum theory. You’re not being given the standard take of how to understand knowledge fr…

Chess, the game of war on 64 squares. But I wondered, can chess be played with hexagons? There have been several attempts, the most successful published in a book in the UK in 1973, which I promptly ordered to investigate. While waiting for one of the re…

Hi everyone, Sal Khan here. Welcome to the Homeroom live stream. We have a very exciting guest today. We’re gonna have John Dickerson, who works for 60 Minutes, a CBS contributing analyst, contributes to The Atlantic, and also has written “The Hardest Job…

Nobody knows anything about Al’s going on with my lights out here. They don’t. My own lines are out here, and that’s all people know. They are so mysterious. People don’t see them; they’re like little cat yetis. Okay, take away that cat Yeti thing. Brill…

[music playing] FRANCESCA FIORENTINI (VOICEOVER): That’s how I ended up in a body farm, the biggest one in the country. The Forensic Anthropology Research Center in South Texas studies how bodies decompose, and why. Their research helps law enforcement o…

I’m showing you this beautiful picture of snow-capped mountains overlooking this alpine lake because there’s a lot of light moving around. Now we’re going to talk about the different ways that light can interact with different media. But what I’m talking…