5 July 1687 July 4, 2015 Author: Staff Isaac Newton publishes Philosophiæ Naturalis Principia Mathematica. Famous Words of Inspiration..."Until you have formed the habit of looking for the good instead of the bad there is in others, you will be neither successful nor happy." Napolean Hill — Click here for more from Napolean Hill Related posts: 5 July 1687 17 October 1979 4 July 1569 5 July 1948 5 July 1948 5 July 1946 Categories: History Tags: 1687, 5 July