Safari Live - Day 368 | National Geographic

A lot of times people ask the question, “Well, why are you rehabbing a squirrel? It’s a road, and there’s tons of them. What’s one less?” Well, squirrels play an important part in the whole ecosystem. They are prey animals, so they help feed a lot of the…

Hello Grim Marians! Today, I want to talk about one of the absolute thorniest issues in usage of English, and it’s the difference between “there,” “their,” and “they’re.” If you can’t tell the difference from the way I’m saying it, that’s because it’s rea…

So I have written here the formal definition for the partial derivative of a two-variable function with respect to X. What I want to do is build up to the formal definition of the directional derivative of that same function in the direction of some vecto…

Uh, I mean, my mind is a storm. I don’t think most people would want to be me. They may think they would want to be me, but they don’t. They don’t know—is your storm a happy storm? No. I’ve grown tired of hearing the name Elon Musk and not really understa…

Today I’m taking you along for a day in my life in Tokyo, which is going to be full of eating, and we’re gonna discover so many yummy foods. I woke up early, feeling fresh and ready to start the day. I took a moment to admire the city from my window, the …

One of the big questions we have is when we get to Mars, how much do we impact it? The scientific community is very worried about Mars being contaminated by our efforts to go there and establish a civilization. Because you don’t want human microbes commin…