20 April 1902 April 20, 2014 Author: Staff Pierre and Marie Curie refine radium chloride. Famous Words of Inspiration..."Peace and justice are two sides of the same coin." Dwight Eisenhower — Click here for more from Dwight Eisenhower Related posts: 26 December 1898 1 September 1902 1 September 1902 20 April 1998 20 April 1999 Categories: History Tags: 1902, 20 April