Event:
Columbia returns to Kennedy Space Center from White Sands
More Notable Events on April 6:
1973 Pioneer 11 launched toward Jupiter and Saturn
1957 New York City ends trolley car service
1930 Hostess Twinkies invented by bakery executive James Dewar
1925 1st film shown on an British Air flight
1909 North Pole reached by Americans Robert Peary and Matthew Henson
