How to Get Started, Doing Things that Don't Scale, and Press (How to Start a Startup 2014: 8)

Aside from humans, in particularly your humble narrator, what primate species spends the least amount of time climbing? Gelada monkeys have, like us, adapted for a life spent mostly on the ground. This has produced some unique aspects of gelada anatomy, s…

In my last video, I showed you five fun physics phenomena and asked you how they work. You responded with thousands of comments and some video responses. Well, here are my explanations. Let’s start with the cereal because it seems the simplest, but it tu…

In a remote atoll near Tahiti, Corey Garza, Andy Casagrande, and safety diver Perrick Seibold put themselves in the line of fire. These investigators test the theory that some tiger sharks may work together and hunt in packs. Before they know it, they’re …

Hugo plans to buy packs of baseball cards until he gets the card of his favorite player, but he only has enough money to buy at most four packs. Suppose that each pack has a probability of 0.2 of containing the card Hugo is hoping for. Let the random vari…

This is such an awesome experience! To get up close and personal with the Curiosity rover. I mean, this isn’t the exact one that’s on Mars, obviously, but it’s basically identical. VOICEOVER: I’m here at the Jet Propulsion Lab in Pasadena, California. I …

Stream. For those of you all who have not been here before, this is a way for us all to stay connected. As you have now school closures around the world, Khan Academy is a not-for-profit with a mission of providing a free, world-class education for anyon…