Isaac Newton's most famous work, his Philosophiae Naturalis Principia Mathematica ( Mathematical Principles of Natural Philosophy ) or Principia , as it is commonly called, of 1687, was written in a secret code--a code that has remained uncracked to this day. This book cracks Newton's secret code. The cracking of Newton's secret code will have profound implications on our understanding of reality, even today. Contemporary physicists acknowledge that Albert Einstein's cosmology is incomplete, and by cracking Newton's code, we will be able to complete Einstein's incomplete cosmology. Newton was a devoutly religious Christian, and by decrypting his secret code, we will discover how he had considered himself to have proven the existence of God's presence in the natural world. Newton was an alchemist, and by decrypting his secret code, we will discover how he had considered himself to have accomplished the most sought-after goal in alchemy. Cracking Newton's secret code will require of us no more than a grade school understanding of mathematics and of physics, and it will reveal to us the simplicity of a breathtakingly beautiful Universe. And perhaps most significantly, cracking Newton's secret code will reveal to us the grand, underlying order that unifies all.