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The day the first person went into space – level 1

12-04-1961

Yuri Gagarin is 27 years old. He is preparing for his...



The day the first person went into space – level 2

12-04-1961

Yuri Gagarin was 27 years old when he was preparing for...



The day the first person went into space – level 3

12-04-1961

Yuri Gagarin was 27 years old when he was preparing for...



The day of the first published photograph of a black hole – level 1

10-04-2019

Messier 87 is a galaxy. It is 55 million light-years away...



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

10-04-2019

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 of the Smolensk air disaster – level 1

10-04-2010

On April 10, 2010, a Polish plane is flying to Russia....



The day of the Smolensk air disaster – level 2

10-04-2010

On April 10, 2010, a Polish plane was flying to Russia....



The day of the Smolensk air disaster – level 3

10-04-2010

On April 10, 2010, a Polish government plane headed to Russia...



The day the American Civil War ended – level 1

09-04-1865

In 1861, the situation in the United States isn’t easy. There...