July 6

1854: German physicist Georg Simon Ohm, in honor of whom the unit of resistance is named, died. 1885: Louis Pasteur successfully tested his anti-rabies vaccine. 1905: For the first time fingerprints were exchanged between international law enforcement. 1920: A radio compass was used for first time for aircraft navigation to fly from Hampton Roads directly to the battleship Ohio. 1923: The Union of Soviet Socialist Republics (USSR) was formed. 1928: The first all-talking motion picture was shown in NY. 1931: Edward Acheson, inventor of abrasive carborundum, the 2nd-hardest substance after diamond, died. 1932: The postage rate for first class mail in the U.S. went from 2¢ to 3¢. 1948: Freida Hennock became the first woman to serve as the commissioner of the FCC. 1958: Alaska became the 49th state. 1986: National Air Traffic Control Day was first observed. 1997: The Mars Pathfinder deployed the remote-controlled Sojourner to explore the surface of Mars. 1998: Singing cowboy Roy Rogers died. 2000: The German parliament offered a formal apology to Nazi-era slave and forced laborers as it passed a bill setting up a 5 billion-dollar compensation fund.