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The day Nautilus traveled under the North Pole – level 3

03-08-1958

On August 3, 1958, the United States Navy submarine Nautilus became...



The day World War I started – level 1

28-07-1914

In 1914, countries in Europe are in two groups. Germany, Austria-Hungary,...



The day World War I started – level 2

28-07-1914

In 1914, countries in Europe were in two groups. Germany, Austria-Hungary,...



The day World War I started – level 3

28-07-1914

In 1914, countries in Europe were divided into two coalitions. On...



The day GPS was fully operational – level 1

17-07-1995

GPS is a system which gives information about your location on...



The day GPS was fully operational – level 2

17-07-1995

The Global Positioning System (GPS) is a satellite system which gives...



The day GPS was fully operational – level 3

17-07-1995

The Global Positioning System (GPS) is a satellite system that provides...



The day of the first atomic bomb explosion – level 1

16-07-1945

On July 16, 1945, the United States does the first successful...



The day of the first atomic bomb explosion – level 2

16-07-1945

On July 16, 1945, the United States did the first successful...



The day of the first atomic bomb explosion – level 3

16-07-1945

On July 16, 1945, the United States successfully conducted the first...