With his masterwork of physics, the Philosophiæ Naturalis Principia Mathematica, Isaac Newton changed our understanding of how the world works. He was able to describe and predict natural phenomena to a degree which had never been done before, and his principles continue to be used to this day. Yet Newton was never under any illusion about the limitations of his brilliance. Despite all he’d discovered, he admitted to feeling like “the great ocean of truth lay undiscovered before me.” Even the great Isaac Newton knew he didn’t know it all!