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July 27 in history: Geneva convention, testing first commercial flight in England and more

1921
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1921

Frederick Banting and Charles Best isolate insulin at University of Toronto. 

1929
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1929

53 nations sign Geneva Convention on treatment of prisoners of war. 

1949
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1949

First commercial jet makes test flight in England. 

1974
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1974

House begins impeachment of US President Richard Nixon. 

1987
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1987

French salvage crew brings back first objects from the Titanic.