Supernovy

What I want to do in this video is try to get a better understanding of the structure of the earth. And we're actually going to think about it in two different ways. So let me just draw half...

In the last video I mentioned how I've been asked to make predictions for the year 2060. And the last one I focused on education, and that's obviously what I'm working on now....

This right here is a picture of Henrietta Swan Leavitt. And she made, a little over 100 years ago-- this is in the early 1900s, while working for Edward Charles Pickering, who was a Harvard...