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How was the Korean system of writing developed

the development of the Hangul alphabet is traditionally ascribed to Sejong, fourth king of the Chosŏn (Yi) dynasty; the system was made the official writing system for the Korean language in 1446 by one of Sejong's decrees.

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- "it was a failure that was an embarrassment for the kennedy administration."

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aug 15, 2012 - although van leeuwenhoek was not the inventor of the microscope, he advanced it more he loved to grind and focus a new lens in order to see the unseen world. most of leeuwenhoek's microscopes were silver. in a simple but significant experiment (1668), he demonstrated that worms found on