Safari Live - Day 42 | National Geographic

On November 22, 2014, a burst of x-rays was detected by ASASSN—that’s the All Sky Automated Survey for Super Novae. But this was no supernova. The signal came from the center of a galaxy around 290 million light-years away, and what we now believe happene…

About 1881, Sierra Blanca was where the major railroads met and fought. There’s only one route to get from the rest of Texas to El Paso, so Texas Pacific raced through the Southern Pacific. Whoever got through the pass first would control the route to Cal…

I’m very proud to say that this property right here was free. It cost me zero dollars. I was able to buy an income-generating property here in Los Angeles for nothing, and I think it’s at this point that people are supposed to comment, “It’s free real est…

Tomas dropped off two packages to be shipped. One package weighed 1.38 kg and the other package weighed 720 g. So the first one they given in kilograms and the second one they give us in grams. What was the combined weight of both packages in grams? So w…

In this video, we are going to use the GDP equation that we have seen before to think about how national savings relates to investment. Really, it’s a way to algebraically manipulate things to ensure that it fits with our intuition. So another way to thin…

Let’s see if we can find the limit as theta approaches 0 of ( \frac{1 - \cos(\theta)}{2 \sin^2(\theta)} ). And like always, pause the video and see if you could work through this. Alright, well our first temptation is to say, well, this is going to be th…