Safari Live - Day 42 | National Geographic

In a previous video, we’ve introduced ourselves to the idea of federalism in the United States. At a high level, you could view it as a contract between a national government and the states of which it is made. But you could also view it as a layered form…

This wildlife refuge is on a remote windy island between Nicaragua and Costa Rica. It’s dedicated to protecting seabirds, especially the large populations of brown pelicans and magnificent frigate birds that nest here. Frigate birds have extraordinarily …

Hi everyone, Sal Khan here. Welcome to our homeroom live stream! Today, we have a disappointing guest—it is me. We’ll be doing an “Ask Me Anything,” so feel free to start putting your questions in the message boards down below or wherever they are on the …

Mars is a disappointing hellhole lacking practically everything we need to stay alive. It looks like we’ll only ever have small crews spend a miserable time hidden underground. Except, we could terraform it into a green new world. But to solve the planet’…

Hydrochloric acid is an example of a strong acid, and sodium hydroxide is an example of a strong base. When an aqueous solution of hydrochloric acid reacts with an aqueous solution of sodium hydroxide, the products are an aqueous solution of sodium chlori…

Squanto is actually a real figure in American history. Quanto is from the Pawtuxet tribe, and Squanto actually is a way for like a decade. He’s enslaved, he’s captured by Europeans, and he learns the English language. A decade later, he comes back, finds …