Curious Events Day
Curious Events Day is held on October 9. This event in the first decade of the month October is annual. 
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Sometimes things happen that humans just can’t explain in the short-term—or for a long while after. Curious Events Day is October 9 and it's the day to wonder about everything we've ever wondered about.
In 2014, Australian native Ben McMahon spent a week in a coma following a car accident. When he awoke, the English speaker instead spoke fluent Mandarin, which he had previously studied, but not to any strong level. Scientists understand that brain trauma can damage portions areas of the brain where speaking skills are stored, possibly causing the brain to re-circuit to other language skills—regardless of how minimal—stored in different zones. But how sudden fluency is achieved isn't known. How curious.
Similar holidays and events, festivals and interesting facts
Confucius Day on October 8 (Confucius' birthday falls on the 27th day of the eighth lunar month according to the Chinese calendar);
American Touch Tag Day on October 8
Hug a Drummer Day on October 10 (is celebrated all around the world in order to pay tribute to and show appreciation for the drummers in bands);
World Porridge Day on October 10
It's My Party Day on October 11
Moment of Frustration Day on October 12 (is the opportunity to let your frustrations out);
Old Farmers Day in USA on October 12
Diver's Day on October 12