• 1906 San Francisco Earthquake
  https://earthquake.usgs.gov/earthquakes/events/1906calif/18april/ 
• 1955 Death of Albert Einstein
  http://news.bbc.co.uk/onthisday/hi/dates/stories/april/18/newsid_3721000/3721783.stm 
• 1923 USA Yankee Stadium
  https://www.baseballhistorycomesalive.com/yankee-stadium-bronx-april-18-1923-ruth-homers-in-first-game-at-yankee-stadium-in-4-1-win-over-boston/ 

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