Yes, Earth has a pulse: peaks of geologic activity that occur every 27.5 million years, and herald mass extinctions. Learn more in this episode of BrainStuff, based on this article: https://science.howstuffworks.com/environmental/earth/geophysics/earths-pulse.htm

American Versus British English: What Are Biscuits, Muffins, and Pudding?
09:51

How Do Sunspots Work?
14:22

Did the Lost Continent of Lemuria Really Exist?
11:05