Safari Live - Day 129 | National Geographic

MORGAN FREEMAN: I was a little kid during World War II. And following the end of the war, of course, glory and bravery and patriotism instilled in me. And where do I go? Air Force. How’d you feel going in? So when I joined the military, I really did it to…

Everyday each of us fights a battle that the rest of the world knows nothing about. This struggle isn’t with the outside world but within the confines of our own minds. Marcus Aurelius, a Roman emperor and a stoic philosopher, once wrote in his personal n…

In 1989, the largest oil spill in US history destroyed a remote Alaskan wilderness. That was a long time ago. Most people say the sound is back to normal, except for this man. He’s been studying killer whales caught up in the spill. He believes they’re st…

[Voiceover] We’re told, let f of x equal g of x over x squared minus x minus six, where g of x is a polynomial. Which of the following is a possible graph of y equals f of x? And they give us four choices. The fourth choice is off right over here. And l…

Let’s say that Y is equal to five minus three X over x squared plus three X, and we want to figure out what is the derivative of Y with respect to X. Now, it might immediately jump out at you that look-look, Y is being defined as a rational expression her…

Let’s talk a little bit about crystalline and amorphous polymers. Now, in previous videos we talked about crystalline versus amorphous solids. Crystalline solids have a very regular pattern; maybe they look something like this if you imagine the particle…