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The day the Empire State Building opened – level 2

01-05-1931

The construction of the Empire State Building began in 1930. It...



The day the Empire State Building opened – level 3

01-05-1931

The construction of the Empire State Building began in 1930. It...



The day the first satellite was launched – level 2

04-10-1957

Sputnik was one of the most famous objects which people made....



The day the first satellite was launched – level 3

04-10-1957

It was one of the most famous objects ever created by...



The day Stanislav Petrov saved the world from the apocalypse – level 3

26-09-1983

Stanislav Petrov saved the world in 1983. On September 26, 1983,...