Hawking with Newton's Copy of Principia Mathematica (image) University of Cambridge Share Print E-Mail Caption This is Hawking with Newton's copy of Principia Mathematica. Credit Graham CopeKoga Usage Restrictions Please credit. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.