In 1834, sandpaper was patented. In 1937, Congress passed the Marihuana Tax Act. The Act was overturned in 1969 in Timothy Leary v. United States. In 1940, Auschwitz opened. In 1953, Elvis Presley graduated from high school. It's Alois Alzheimer's birthday. Burl Ives's. Che Guevara's. Jerzy Kosinski's. Boy George's. Steffi Graf's. It's Flag Day. Mission: Don't be abrasive.