Hangul Day
Before the creation of Hangul, people in Korea (known as Joseon at the time) primarily wrote using Classical Chinese alongside native phonetic writing systems that predate Hangul by hundreds of years, including idu, hyangchal, gugyeol, and gakpil. However, due to the fundamental differences between the Korean and Chinese languages, and the large number of characters needed to be learned, there was much difficulty in learning how to write using Chinese characters for the lower classes, who often didn't have the privilege of education. To assuage this problem, King Sejong created the unique alphabet known as Hangul to promote literacy among the common people.
Burling Hull
Hull claimed to be — and is generally credited as — the inventor of the Svengali deck of cards, which he patented in 1909. He claimed to have invented more than 500 magical effects and he was a prolific writer, with 52 published books to his name, including "Sealed Mysteries and Sleights", "The Encyclopedia of Stage Illusions", "Sealed Mysteries", and "How to Answer Questions for Crystal Gazing and Mind Reading Acts". He wrote on a wide variety of magical subjects, including card tricks, mentalism, escapes, razor blade swallowing, sightless vision, billiard ball manipulation, silk magic, second sight acts, publicity, and showmanship.