Sir Isaac Newton "English physicist and mathematician Sir Isaac Newton, most famous for his law of gravitation, was instrumental in the scientific revolution of the 17th century" (bio.com). Born on December 25, 1642 (Julian Calendar) in Woolsthorpe, Lincolnshire, England ~1645 (3 yrs old)- Newton's mother remarried and left him with his grandmother. ~1654 (12 yrs old)-Newton's mother returned with her three children from her second marriage after her husband died. 1661-Newton enrolled at the University of Cambridge's Trinity College. 1665-Newton left college because the Great Plague was rampant in Europe. 1666-Observation of the Fall of the Apple 1667-Newton returned to Cambridge 1672-“From A Letter of Mr. Isaac Newton” 1678-Emotional Breakdown 1679-d**h of his Mother July 5, 1687 Philosophiæ Naturalis Principia Mathematica ("the Principia") was published including one of his most famous theories, Newton's Law of Universal Gravitation 1704-Publish of his book Opticks 1705-Newton was knighted Died March 20, 1726 (age 84)