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1957 Singapore gains self rule from the British
http://news.bbc.co.uk/onthisday/hi/dates/stories/april/11/newsid_2828000/2828903.stm
1965 The Palm Sunday Tornadoes strike Indiana and the surrounding states
https://www.weather.gov/ind/palmsuntor
1970 NASA’s Apollo 13
https://www.britannica.com/topic/Apollo-13-mission 

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