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The day Deepwater Horizon sank – level 3

22-04-2010

Deepwater Horizon was a modern oil drilling rig located in the...



The day of the first published photograph of a black hole – level 2

10-04-2019

The first black hole ever photographed is located at the center...



The day of the first published photograph of a black hole – level 3

10-04-2019

The first black hole that was photographed is located at the...



The day Martin Luther King was killed – level 3

04-04-1968

In 1955, slavery hadn’t existed in the United States for 90...



The day of the oil disaster in Alaska – level 3

24-03-1989

The Gulf of Alaska was a place with beautiful nature, surrounded...



The day the telephone was patented – level 2

07-03-1876

Alexander Graham Bell started his experiments in 1873. He was trying...



The day the telephone was patented – level 3

07-03-1876

Since 1873, Alexander Graham Bell was trying to find a way...



The day the order to kill the Polish elite was signed – level 1

05-03-1940

It is September 1, 1939. Germany attacks Poland. Two weeks later,...



The day the order to kill the Polish elite was signed – level 2

05-03-1940

In August 1939, the Soviet Union and Germany signed a non-aggression...



The day the order to kill the Polish elite was signed – level 3

05-03-1940

In August 1939, the Soviet Union and Germany signed a non-aggression...