2014 Event Facebook reports that over 90% of its tech employees are Asian or white, while women make up only 15% of tech employees and 31% of all employees; COO Cheryl Sandberg notes that more women are also needed in leadership roles at the company 2001 Death Cliff Hillegass, businessman, invented Cliffs Notes, dies at 83 1995 Death Arthur S Taylor, Jr., U.S. drummer/author (Notes on notes), dies at 65 1986 Event Netherlands Bank issues 250 guilder notes 1980 Event Post It Notes, introduced 1976 Event Federal Reserve begins issuing $2 bicentennial notes 1961 Event Old type, black and white notes cease to be legal tender 1953 Event Schools 1st use Cliff's Notes 1492 Event Christopher Columbus notes 1st recorded reference to tobacco