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The day of the first published photograph of a black hole – level 2
10-04-2019The first black hole ever photographed is located at the center...
The day of the first published photograph of a black hole – level 3
10-04-2019The first black hole that was photographed is located at the...
The day Martin Luther King was killed – level 3
04-04-1968In 1955, slavery hadn’t existed in the United States for 90...
The day of the oil disaster in Alaska – level 3
24-03-1989The Gulf of Alaska was a place with beautiful nature, surrounded...
The day the telephone was patented – level 2
07-03-1876Alexander Graham Bell started his experiments in 1873. He was trying...
The day the telephone was patented – level 3
07-03-1876Since 1873, Alexander Graham Bell was trying to find a way...
The day the order to kill the Polish elite was signed – level 1
05-03-1940It is September 1, 1939. Germany attacks Poland. Two weeks later,...
The day the order to kill the Polish elite was signed – level 2
05-03-1940In August 1939, the Soviet Union and Germany signed a non-aggression...
The day the order to kill the Polish elite was signed – level 3
05-03-1940In August 1939, the Soviet Union and Germany signed a non-aggression...
The day Fidel Castro took control over Cuba – level 3
09-01-1959In 1956, after attacks from the Cuban government’s army, revolutionary Fidel...
