https://en.wikipedia.org/wiki/October_19
Some good ones for me:
1900 – Max Planck discovers the law of black-body radiation (Planck's law).
2003 – Mother Teresa is beatified by Pope John Paul II.
2005 – Hurricane Wilma becomes the most intense Atlantic hurricane on record with a minimum pressure of 882 mb.
"After Wilma, no other major hurricane made landfall in the contiguous United States until Hurricane Harvey made landfall in southern Texas on August 26, 2017, ending a record period of 11 years 10 months. During this time, major Atlantic hurricanes occurred slightly more frequently than average; they just didn't make landfall in the United States."
https://en.wikipedia.org/wiki/Hurricane_Wilma
1950 – The People's Republic of China joins the Korean War by sending thousands of troops across the Yalu River to fight United Nations forces.
I was in boot camp in 1951, and our drill instructors had some scary stories to tell about that event.