Safari Live - Day 42 | National Geographic

Hi everyone! Welcome to our homeroom live stream. This is something we started several months ago. It’s really a way to stay connected and have interesting conversations about interesting things with interesting people. I’m super excited about our guest t…

All right. Let’s watch it. Hopefully I am not horribly wrong. Derek is giggling to himself right now. Ok, you have made your prediction. Now it is time to find out which block went higher, the one that is shot off center or the one that is shot right i…

Human society is extremely complex and fragile, built upon various pillars. One of them is the honey bee. One out of three meals eaten by humans is made possible by honey bees. They are so important that if all the honey bees were to die out, thousands of…

The universe was really small and dense at one point, and then all of a sudden it wasn’t. But whoa, whoa, wait a minute! Let’s rewind and figure out what happened right here. This is because of two things: entropy and dark energy. Put it simply, entropy …

Today in the gym, when my wife was doing dumbbell curls, I started wondering. See, she’s putting a force on that dumbbell upwards, right? But does that force stay constant as she moves the dumbbell up, or not? Does it change? And if it does change, how do…

Hi, I’m Salon, founder of the Khan Academy, and I just wanted to let you know how excited all of us are for what we have in store this coming back to school. First and foremost, this is going to be a big effort in terms of working with teachers and class…