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The day the human DNA was mapped – level 3
14-04-2003In 1990, scientists started a project with the goal of mapping...
The day of the first published photograph of a black hole – level 1
10-04-2019Messier 87 is a galaxy. It is 55 million light-years away...
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 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 the world saw the first cloned sheep – level 1
22-02-1997Dolly is a sheep. She is born on July 5, 1996....
The day the world saw the first cloned sheep – level 2
22-02-1997Dolly was a sheep born on July 5, 1996. She looked...
The day the world saw the first cloned sheep – level 3
22-02-1997Dolly was a sheep born on July 5, 1996. At first...
