What was powerful about this is it challenged centuries-old ideas about how the universe worked. And at a meta level, it was about using new methods and evidence in order to make conclusions no matter how revolutionary those conclusions might be. And this publication is often cited as the beginning of what will be known as the Scientific Revolution. Many people view the capstone of the Scientific Revolution to be Newton's publication of Principia in 1687. And this is an incredibly powerful publication. It describes the laws of the universe. It's a universe in which most things can be explained with simple principles, with mathematics.