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May 11th might seem like any other day in the calendar, but this date is quite the contrary—a host of unrelated but equally intriguing holidays and celebrations fall on this day, making it unique for a variety of reasons.

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Interesting Facts of May 11th

  1. 1. The Diamond Sutra, the world's oldest known printed book using woodblock printing, was dated on May 11th, 868, demonstrating the advanced printing techniques already developed in Tang Dynasty China.
  2. 2. Siam changed its name to Thailand for the second time on May 11th, 1949. The country was known as Siam until 1939, changed to Thailand, switched back to Siam in 1945, and finally became Thailand again on this date.
  3. 3. On May 11th, 1997 IBM's Deep Blue chess computer defeated World Chess Champion Garry Kasparov. This match marked the first time a reigning world champion lost a match to a computer under standard chess tournament conditions.
  4. 4. Minnesota was admitted as the 32nd U.S. state on May 11th, 1858.
  5. 5. On May 11th, 1995 more than 170 countries agreed to extend the Nuclear Nonproliferation Treaty indefinitely and without conditions, aiming to prevent the spread of nuclear weapons and to further the goal of complete disarmament.