Leonardo da Vinci's early sketches of human flight make rare US visit in Smithsonian exhibit

  • by: Associated Press
  • Updated: September 13, 2013 - 9:10 AM

WASHINGTON — Leonardo da Vinci's early notes and sketches of human flight some 400 years before the airplane's invention are making a rare visit to the Smithsonian's National Air and Space Museum in Washington.

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